Turkish Prime Minister Recep Tayyip Erdogan urged international steps t be taken against the regime of Syrian President Bashar al-Assad.

Turkish Prime Minister Recep Tayyip Erdogan urged international steps t be taken against the regime of Syrian President Bashar al-Assad, saying that Ankara could not remain “spectator” over the events in the crisis-hit country.

"There is a build-up in Aleppo, and the recent statements with respect to the use of weapons of mass destruction are actions that we cannot remain an observer or spectator to," Erdogan said at a joint news conference in London with British Prime Minister David Cameron.

"Steps need to be taken jointly within the United Nations Security Council, the Organization of Islamic Countries, the Arab League, and we must work together to try to overcome the situation," he said.

For his part, Cameron said Britain and Turkey were “concerned” that Assad's government was about to carry out "some truly appalling acts around and in the city of Aleppo".

"In Aleppo itself the regime is preparing for an attack with its tanks and helicopters ... My hope is that they'll get the necessary answer from the real sons of Syria," Erdogan said earlier in remarks broadcast on Turkish TV channels.