A suicide bomber on a motorbike wounded several Indonesian police outside a police building in Surabaya, a day after Islamist militants launched suicide attacks on churches in the country’s second largest city. 

The explosion on Monday morning injured several officers, just outside a checkpoint at a police headquarters in Surabaya, Indonesia's second largest city.

"Both four-wheeled and two-wheeled vehicles are still under assessment as the incident is still very fresh," police spokesman Frans Barung Mangera said.

Indonesia's police chief says the attack was carried out by a family, including a small child.

And that four people have been arrested so far, with one person shot dead.

It comes just a day after another similar, devastating attack in the same city.

On Sunday, a family of six launched suicide attacks on three different churches, killing at least 13 people and wounding dozens of others.

The country will not let this kind of cowardice be allowed

The country's police chief says the husband of that family was the head of a local cell of an Islamist group.

That earlier bombings were also carried out with children as young as nine years old.

President Joko Widodo spoke out after what's being called one of the deadliest attacks in his country's history.

"The country will not let this kind of cowardice be allowed. I'm calling for the public to fight terrorism and radicalism, which are against the values of religion, and our values as a nation that upholds the value of God and diversity."

Indonesia, the world's largest Muslim-majority country, has seen a recent spike in homegrown insurgency, in part inspired by Islamic State.

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