(Changes number of those convicted in Denmark in last paragraph)

SARAJEVO, June 18 (Reuters) - A Bosnian appeals court on Monday halved the jail terms for a Swede, a Turk and a Bosnian convicted of planning a suicide attack in Europe to try to force European troops out of Iraq and Afghanistan.

The sentence of Mirsad Bektasevic, 19, a Swede of Bosnian heritage, was cut to eight years and four months; that of Denmark-based Turk Abdulkadir Cesur, 21, to six years and six months and that of Bosnian Bajro Ikanovic, 29, to four years.

The court also reduced the sentence of a Bosnian Muslim accomplice, Senad Hasanovic, to six months.

Bektasevic, who was born in Serbia, and Cesur came to Bosnia in 2005 to plan the attack. They were arrested with Ikanovic in October 2005 in Sarajevo. Police found explosives, weapons and a video which showed how to make a bomb.

Police also found a will in the apartment of Bektasevic in which he left 500,000 Swedish krona ($71,030) to relatives and to a branch of the al Qaeda network.

Almost half of the population in Bosnia are Muslims.

After the 2001 attacks on the United States, Bosnia came under pressure to investigate the hundreds of Islamic fighters who stayed after the 1992-95 war with Bosnian Croats and Bosnian Serbs. Half of them have had their Bosnian citizenship revoked.

In a case that media speculate is connected, four Muslims in Denmark were arrested shortly after the Sarajevo arrests, and one of them was found guilty of planning an attack in Europe.

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