The bomb, apparently targeting a bus carrying police officers, exploded outside the stadium of Istanbul football club Besiktas following its match against Bursaspor, Interior Minister Suleyman Soylu said.

"A car packed with explosives is believed to have exploded where our riot squad was deployed shortly after the football fans dispersed following the match," he said.

"The attack targeted the riot police's bus," the minister said, adding that nearly 20 officers had been wounded.