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MADRID - Spanish police have arrested three more suspects, all of them Moroccans, in connection with the March 11 train bombings in Madrid that killed 190 people, court sources said on Thursday.

The arrests bring to 16 the number of people detained for the deadliest bombing attack in Europe in 15 years.

The three are suspected of collaborating in the bombing plot but are not believed to have had a central role, the court sources said.

Thirteen of the 16 suspects in custody are from Morocco and investigators suspect the attacks were carried out by Islamic radicals linked to Osama bin Laden's Al-Qaida network.

One Spaniard has been arrested for allegedly helping the perpetrators steal dynamite used to make the bombs. Court sources said they believe a second Spaniard may have helped steal the dynamite.

Two of the latest arrests were in Ugena, a town near the historic city of Toledo south of Madrid, and the third suspect was picked up in Madrid.

Police also searched two homes and one business in Madrid on Wednesday night as part of the investigation, which involves hundreds of agents from 25 separate law enforcement teams.

In addition to the 190 deaths, about 1,900 people were wounded when 10 bombs exploded at roughly the same time on four packed commuter trains on the morning of March 11.

The attack helped tilt March 14 general elections to the opposition Socialist Party.

A man claiming to be a spokesman for Al-Qaida in Europe claimed responsibility for the attacks in a videotape that surfaced on election eve.

Many Spaniards believe their capital was targeted in revenge for their government's support of the war in Iraq, which was already an unpopular policy at home. Voters handed the ruling party a shock defeat in the elections held just three days after the attack.