Rebel fighters are battling Syrian government troops inside a massive prison in Syria's northern city of Aleppo.
The AP reported fighting continued into the night as a stalemate drew on.
There are conflicting reports from both government and opposition forces who both claim to be making progress in the battle.
The opposition did confirm to the BBC that pro-Assad forces used air raids and tanks to ward off their assault at the prison.
It remains unclear if the rebels goal was to free the prisoners aligned with their cause.
More from GlobalPost: UN General Assembly condemns Assad's regime as death toll tops 80,000
On Wednesday, the United Nation's General Assembly passed a resolution condemning Syria's government for "gross violations" of human rights and recognized opposition umbrella group, the Syrian National Coalition.
Meanwhile across Syria, the Internet was back up after a day-long blackout, the second in a week, the AP said.