IS militants 'using chlorine bombs'
New allegations have emerged that Islamic State extremists have expanded their arsenal with chlorine bombs and captured fighter jets - weapons that could help the militants in Iraq and Syria.
Kurdish fighters in the key Syrian border town of Kobani have held off a month-long offensive by the Islamic State group with the help of a US-led campaign of air strikes.
Turkey's president said he will allow Syrian rebels to transit through his country to help the town's beleaguered defenders, but both the Kurds and the rebels denied any such plan was in the works, underscoring differences over strategy that are hindering efforts to roll back the extremists.
In Iraq, officials said Islamic State militants used chlorine gas during fighting with security forces and Shiite militiamen last month north of Baghdad.
If the reports are confirmed, it would be the first time the Sunni extremists tried to use chlorine since their seizure of large parts of Syria and northern Iraq earlier this year.
The statements in Iraq came two days after Kurdish officials and doctors said they believed IS militants had released some kind of toxic gas in an eastern district of Kobani.
Aysa Abdullah, a senior Kurdish official based in the town, mentioned the attack took place late on Tuesday and that some people suffered symptoms that included dizziness and watery eyes. She and other officials said doctors lacked the equipment to establish what kinds of chemicals were used.
US Secretary of John Kerry said he could not confirm the Iraqi allegations that toxic gas was used against security forces and Shiite militias, but he called the charges "extremely serious." He said chlorine can be considered a chemical weapon if it is mixed with other toxic agents.
"The use of any chemical weapon is an abhorrent act," Mr Kerry said at a news conference in Washington. "It's against international law. And these recent allegations underscore the importance of the work that we are currently engaged in."
Three Iraqi officials - a senior security official, a local official from Duluiya and an official from Balad - told The Associated Press that the Islamic State group used bombs with chlorine-filled cylinders during clashes in late September in the two towns.
The militants have failed to capture both Duluiya, 45 miles north of Baghdad, and Balad, 50 miles north of the Iraqi capital.
In the attacks, about 40 troops and Shiite militiamen were slightly affected by the chlorine and showed symptoms consistent with chlorine poisoning, such as difficulty in breathing and coughing, the three officials said. The troops were treated at a hospital and recovered quickly.
The senior security official said it was most likely that the Islamic State fighters used chlorine from water purification plants located in the areas they had overrun.
Earlier this year, a UN fact-finding mission sent to investigate alleged chlorine attacks in Syria was ambushed and briefly detained by armed men in rebel-held territory. The mission had said it was virtually certain chlorine had been used as a chemical weapon in northern Syria.
Syrian President Bashar al-Assad had agreed with the United States and Russia to dispose of his chemical weapons - an arsenal that Damascus had never previously formally acknowledged - after hundreds of people were killed in a sarin gas attack on the outskirts of the capital in the summer of 2013. Chlorine was not listed as part of the Syrian arsenal.