SURABAYA, Indonesia (AP) — The Latest on the series on bomb attacks in Indonesia (all times local):

11:10 a.m.

CCTV footage of an attack on the police headquarters in the Indonesian city of Surabaya shows at least one explosion as two motorcycles, each with two people aboard, drive into a security checkpoint. 

The footage of Monday's attack shows the motorcycles, moving closely together, pull up alongside a car and four officers manning opposite sides of the checkpoint. At the moment of the explosion, two apparent civilians are walking into the checkpoint just meters from the motorcycles.

A split second after the first blast, a possible second blast is seen.

One of the bystanders apparently escapes serious injury and the fate of the second is unclear.

Three of the officers at the checkpoint are standing right by the motorbikes when the detonation happens. 

11 a.m.

Indonesian police say four officer and six civilians have been wounded in a bomb attack on their headquarters in the city of Surabaya.

Security footage shows at least one motorcycle was used in Monday's attack.

The attack follows suicide bombings at three churches in the city on Sunday that killed at least eight members of the public as well as six people from one family who carried out the bombings.

7:55 a.m.

The United Nations secretary-general has condemned the suicide bombings of three churches in Indonesia's second-largest city of Surabaya.

A spokesman for Secretary-General Antonio Guterres issued a statement saying he was "appalled" at reports that children were used in Sunday's attacks.

The statement issued Sunday offered condolences to the families of victims and said the U.N. stands by Indonesia's efforts to fight extremism and prevent terrorism.