BAGHDAD (AFP) - The international coalition against the Islamic State in Iraq and Syria (ISIS) extremist group bombed a key militant command and supply hub in the area of Ramadi, capital of Iraq's Anbar province, it said Wednesday.

A video of the strike on the football stadium showed a massive secondary explosion at the site.

"The stadium was a key (ISIS) command and supply hub in the Ramadi region and was being used to store large amounts of homemade explosives, weapons and ammunition," the coalition said in a statement.

"Destroying this hub will significantly disrupt (ISIS') ability to conduct operations and resupply their fighters in Ramadi."

ISIS overran Ramadi in mid-May in a major setback for Iraqi forces, which had held out against militants in parts of the city for well over a year.

ISIS seized swathes of Iraqi territory in a June 2014 offensive, and the coalition is carrying out daily air strikes against the militants to assist Iraqi forces, which have made little progress on the ground in recent weeks.