Activists are reporting that an airstrike on a prison run by al-Qaida's affiliate in Syria of the country has killed at least 39.
The Britain-based Syrian Observatory for Human Rights said 39 people were killed, including many fighters from the Nusra Front as well as detainees in the northwestern town of Maaret al-Numan.
The Local Coordination Committees, another activist group, said the airstrike killed 51.
Conflicting figures are common in the aftermath of airstrikes in Syria.