A suspected suicide bomber¹ has attacked a mosque² in Indonesia, killing³ himself and wounding 28 people.

印度尼西亚一位自杀式袭击嫌疑犯攻击了一座清真寺，杀死了他自己并导致28人受伤。

Most of the wounded are police officers, as the attack happened during Friday prayers at a mosque in a police compound in Cirebon, West Java.

It is the first suspected suicide attack in the country in two years but follows a recent spate⁴ of letter bombs.

A majority of Indonesians are Muslims but the state is secular⁵（世俗的，长期的） .

Witnesses said the man was sitting among worshippers when he set off the explosives.

"He was praying. From the third row, suddenly there was a blast. I was at the last row," one witness named Anton was quoted as saying by Detik news website.

"We suspect it was a suicide bombing," Indonesian police spokesman Anton Bachrul Alam said.

"The police have been the most active in fighting terrorism and that is why they are furious with us," he added.

The BBC's Alice Budisatrijo in Jakarta says several high profile militants⁷ suspected of involvement in past bombings in Indonesia have recently been arrested or killed by the police.

"It looks like there has been a shift in the extremists' target, from Western to state symbols," Noor Huda, a security analyst⁸, told the BBC.

"It's their revenge（报复） for what they see as injustice⁹ committed against them by the police and other authorities."

In December, one of Indonesia's most-wanted Islamic militant⁶ suspects, Abu Tholut, was arrested on suspicion of helping¹⁰ to set up a militant training camp in Aceh province, recruiting militants and raising funds for "terror activities".

The highest-profile arrest has been that of cleric Abu Bakar Ba'asyir, seen by many as the spiritual leader of many of Indonesia's radical¹¹ groups.

He is currently on trial in Jakarta.

In recent years, Indonesia has introduced a combination of new laws, anti-terror training, international co-operation and reintegration measures to tackle militancy¹²（战斗性） .