A car bomb exploded near a police vehicle in Istanbul, Turkey on Tuesday, killing 11 people and wounding 36 others.
There were no immediate claims of responsibility, but four people were detained in connection to the blast. This is the fourth bombing to hit Istanbul this year.
Tuesday's bombing, which occurred during rush hour, detonated as the police bus was passing. Seven police officers and four civilians were among the dead.
The bus flipped over by the force of the blast and several nearby buildings were damaged.
"These (attacks) are being carried out against people whose duty it is to ensure the security of our people. These cannot be pardoned or forgiven. We shall continue our fight against terrorists fearlessly and tirelessly until the end," President Recep Tayyip Erdogan told reporters, according to the Associated Press.