Police at scene of the blast (photo credit: Reuters)

Suicide bombers have carried out an attack at a police headquarters in Surabaya, Indonesia, a day after a wave of deadly blasts in the city.

According to reports, two people on a motorbike carried out the attack, which injured police officers.

The explosion was said to have occurred at 08:50 local time (01:50 GMT), but the extent of casualties was not immediately clear.

At least 13 people were killed in bomb attacks on three churches on Sunday.

The Islamic State group has said it was behind those attacks.

Indonesian President Joko Widodo described the string of attacks as “cowardly, undignified and inhumane”.

“There will be no compromise in taking action on the ground to stop terrorism,” he said.