Police have had to deal with a number of bombings

A bomb explosion at Jakarta airport has left at least six people injured, police say.

The blast happened at a fast-food restaurant in the F2 domestic departures area, shattering glass panels and leaving casualties covered in blood.

A local television report put the number of injured at 11.

Detective Chief Erwin Mappaseng said it was "clearly caused by a home-made bomb, of a low explosive type". No one had yet admitted causing the explosion.

"This was meant to terrorise people," Mr Mappaseng said.

"If people are scared, then these people have achieved their goal. We're asking people not to panic and to remain calm."

Power cut

Dede, a food stall worker in the airport, said there was a brief power cut in the terminal minutes before the blast.

"Then I heard a loud explosion," he said.

Other witnesses said that windows shattered, and debris was thrown across the terminal building.

One of the victims is reported to be seriously injured and has undergone surgery. Another is said to be a 12-year-old girl.

There are reports that a bag, which may have contained the device, was left under a chair in the area between the Kentucky Fried Chicken restaurant and check-in desks for Garuda, the Indonesian national carrier.

The airport remains open and flights are departing.

Terror trials

The blast comes three days after a bomb exploded outside the United Nations mission in central Jakarta. There were no injuries.

On Wednesday, Abu Bakar Ba'asyir, alleged leader of the Islamic militant group Jemaah Islamiyah, went on trial for treason linked to a number of fatal bombings.

His group is said to want to establish a hardline Islamic state across much of Southeast Asia.

A "similar" bomb exploded outside the UN mission on Thursday

Last week, police announced they had arrested 18 suspected Jemaah Islamiyah members in connection with the Bali bombings in October 2002.

Next month sees trials of some suspects behind the attack, which killed more than 200 people, mostly foreign holidaymakers.

A blast at a McDonald's restaurant in Sulawesi late last year killed three people.

Like McDonald's, KFC is an American-owned restaurant chain.

Top security minister Susilo Bambang Yudhoyono said there could be a connection with the trials of terror suspects, and asked Indonesians to remain vigilant.

"We cannot afford to relax our alertness," he told the French news agency AFP.

"Do not only rely on the police - there should be a national movement to continue preventing these acts of terrorism."