Syrian troops on Friday retook most of Aleppo’s prison, after losses a day earlier, in fighting that killed at least 47 people in two days, a monitoring group said.

But it was unclear if hundreds of prisoners had been able to flee, as reported on Thursday after Islamist and jihadist fighters had overrun the facility.

The Syrian Observatory for Human Rights said regime aircraft were keeping up their daily assault on rebel-held districts of the northern city with barrel bombs.