Syrian warplanes have hit rebel positions near a contested military air base in the northern province of Aleppo, activists have claimed.
The Britain-based Syrian Observatory for Human Rights said fighter jets struck near the Kweiras air base. The group, which relies on a network of informants inside Syria, also reported heavy clashes in the area.
Opposition forces fighting to oust President Bashar Assad's regime have been trying for months to take the Kweiras complex which is close to the border with Turkey.
The opposition has controlled large swathes of land in the north and whole neighbourhoods inside the city of Aleppo since last summer.
Tuesday's air strikes are part of Assad's campaign to reclaim territory the regime lost to the rebels in the past year.