SANTIAGO, Chile -- Three members of an anarchist cell suspected in Chile's worst bomb attack in decades were ordered by a judge Tuesday to remain in jail or under house arrest.

The Sept. 8 blast in Santiago was the first of some 200 Chilean bombings over the past decade known to have caused serious injury to bystanders in what is otherwise one of Latin America's safest capitals.

Prosecutors presented evidence at Tuesday's hearing that included traces of gunpowder and DNA tests that they said linked the suspects to the lunchtime blast. The bomb scattered shrapnel in a crowded underground shopping area connected to a subway station, injuring 14 people.

The judge ordered Juan Flores, 22, and his partner, Nataly Casanova, 24, held in jail. Guillermo Duran, 25, was ordered to be kept under nighttime house arrest.

The three appeared unfazed and often laughed and spoke to each other during the more than three-hour hearing.

The judge gave prosecutors 10 months to gather evidence against the suspects under Chile's anti-terrorism law. The law enacted during the 1973-90 dictatorship lets suspects be held in isolation without charges and permits the use of phone taps and secret witnesses in investigations.

The three also are suspected of involvement in three other bombings, including one at another subway station in Santiago in July that caused material damage and minor injuries.