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In Pictures: African countries battle locust invasion

One swarm measured 60km (37 miles) long by 40km (25 miles) wide in Kenya’s north east, according to the Intergovernmental Authority on Development.

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A farmer’s son raises his arms as he is surrounded by desert locusts while trying to chase them away from his crops in Kenya (Ben Curtis/AP)

A farmer’s son raises his arms as he is surrounded by desert locusts while trying to chase them away from his crops in Kenya (Ben Curtis/AP)

A farmer’s son raises his arms as he is surrounded by desert locusts while trying to chase them away from his crops in Kenya (Ben Curtis/AP)

Locusts by the millions are chomping their way across a large part of Africa in the worst outbreak some places have seen in 70 years.

The locusts are threatening some of the world’s most vulnerable countries, where millions of people already live with the periodic risk of drought or flooding.

“A typical desert locust swarm can contain up to 150 million locusts per square kilometre,” East African regional body the Intergovernmental Authority on Development (IGAD) has said.

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A farmer’s daughter waves her shawl in the air to try to chase away swarms of desert locusts from her crops in Katitika village, Kitui county, Kenya (Ben Curtis/AP)

A farmer’s daughter waves her shawl in the air to try to chase away swarms of desert locusts from her crops in Katitika village, Kitui county, Kenya (Ben Curtis/AP)

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A farmer’s daughter waves her shawl in the air to try to chase away swarms of desert locusts from her crops in Katitika village, Kitui county, Kenya (Ben Curtis/AP)

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Desert locusts have swarmed into Kenya by the hundreds of millions from Somalia and Ethiopia (Ben Curtis/AP)

Desert locusts have swarmed into Kenya by the hundreds of millions from Somalia and Ethiopia (Ben Curtis/AP)

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Desert locusts have swarmed into Kenya by the hundreds of millions from Somalia and Ethiopia (Ben Curtis/AP)

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Farmers try to chase away the locusts from a tree on their land by shaking branches, banging sticks together and shouting (Ben Curtis/AP)

Farmers try to chase away the locusts from a tree on their land by shaking branches, banging sticks together and shouting (Ben Curtis/AP)

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Farmers try to chase away the locusts from a tree on their land by shaking branches, banging sticks together and shouting (Ben Curtis/AP)

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The insects are roughly the length of a finger (Ben Curtis/AP)

The insects are roughly the length of a finger (Ben Curtis/AP)

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The insects are roughly the length of a finger (Ben Curtis/AP)

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They are destroying farmland and threatening an already vulnerable region (Ben Curtis/AP)

They are destroying farmland and threatening an already vulnerable region (Ben Curtis/AP)

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They are destroying farmland and threatening an already vulnerable region (Ben Curtis/AP)

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Kenya has not seen a locust outbreak like this in 70 years, the UN’s Rosanne Marchesich said (Ben Curtis/AP)

Kenya has not seen a locust outbreak like this in 70 years, the UN’s Rosanne Marchesich said (Ben Curtis/AP)

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Kenya has not seen a locust outbreak like this in 70 years, the UN’s Rosanne Marchesich said (Ben Curtis/AP)

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It is also ‘the worst that we’ve seen in Ethiopia and in Somalia in 25 years’, she added (Ben Curtis/AP)

It is also ‘the worst that we’ve seen in Ethiopia and in Somalia in 25 years’, she added (Ben Curtis/AP)

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It is also ‘the worst that we’ve seen in Ethiopia and in Somalia in 25 years’, she added (Ben Curtis/AP)

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The further increase in locust swarms could last until June as favourable breeding conditions continue, the IGAD has said (Ben Curtis/AP)

The further increase in locust swarms could last until June as favourable breeding conditions continue, the IGAD has said (Ben Curtis/AP)

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The further increase in locust swarms could last until June as favourable breeding conditions continue, the IGAD has said (Ben Curtis/AP)

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Major locust outbreaks can be devastating (Ben Curtis/AP)

Major locust outbreaks can be devastating (Ben Curtis/AP)

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Major locust outbreaks can be devastating (Ben Curtis/AP)

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One between 2003 and 2005 cost more than 500 million dollars to control across 20 countries in northern Africa, the UN Food and Agriculture Organisation said (Ben Curtis/AP)

One between 2003 and 2005 cost more than 500 million dollars to control across 20 countries in northern Africa, the UN Food and Agriculture Organisation said (Ben Curtis/AP)

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One between 2003 and 2005 cost more than 500 million dollars to control across 20 countries in northern Africa, the UN Food and Agriculture Organisation said (Ben Curtis/AP)

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It caused more than 2.5 billion dollars in harvest losses (Ben Curtis/AP)

It caused more than 2.5 billion dollars in harvest losses (Ben Curtis/AP)

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It caused more than 2.5 billion dollars in harvest losses (Ben Curtis/AP)

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To help prevent and control outbreaks, authorities analyse satellite images, stockpile pesticides and conduct aerial spraying (Ben Curtis/AP)

To help prevent and control outbreaks, authorities analyse satellite images, stockpile pesticides and conduct aerial spraying (Ben Curtis/AP)

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To help prevent and control outbreaks, authorities analyse satellite images, stockpile pesticides and conduct aerial spraying (Ben Curtis/AP)

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In Ethiopia, officials said they have deployed four small planes to help fight the invasion (Ben Curtis/AP)

In Ethiopia, officials said they have deployed four small planes to help fight the invasion (Ben Curtis/AP)

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In Ethiopia, officials said they have deployed four small planes to help fight the invasion (Ben Curtis/AP)

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The UN has allocated 10 million dollars for aerial spraying (Ben Curtis/AP)

The UN has allocated 10 million dollars for aerial spraying (Ben Curtis/AP)

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The UN has allocated 10 million dollars for aerial spraying (Ben Curtis/AP)

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Humanitarian chief Mark Lowcock said families across the region ‘now face the prospect of watching as their crops are destroyed before their eyes’ (Ben Curtis/AP)

Humanitarian chief Mark Lowcock said families across the region ‘now face the prospect of watching as their crops are destroyed before their eyes’ (Ben Curtis/AP)

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Humanitarian chief Mark Lowcock said families across the region ‘now face the prospect of watching as their crops are destroyed before their eyes’ (Ben Curtis/AP)

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