Four Held in Fatal Bosnia Abduction : Balkans: Muslim bandits are suspected of kidnaping in which U.N. convoy driver died. Italy demands probe into journalists’ deaths.

SARAJEVO, Bosnia-Herzegovina —  Muslim-led Bosnian authorities have detained four men in the abduction of three British aid workers in central Bosnia in which one was shot dead, U.N. officials said Saturday.

Suspected Muslim bandits hijacked a car carrying the three--all U.N. convoy drivers--to a desolate area outside Zenica on Thursday, ordered the aid workers out and opened fire, killing one and wounding the others. The assailants escaped with the car.

Karen Abu Zayd, chief of operations for U.N. aid operations in Bosnia-Herzegovina, was told in a meeting about the incident with senior Bosnian government officials on Saturday that four men had been detained for questioning, a spokesman said.

There was no immediate comment from the Bosnian government. The attack, which raised to 11 the number of staff members of the U.N. Office of the High Commissioner for Refugees killed in Bosnia, was among the worst on foreign aid workers trying to sustain 1.2 million civilians trapped in the center of the republic.

Meanwhile in Rome, Foreign Minister Beniamino Andreatta demanded an investigation into the deaths of three Italian television journalists in Bosnia.

Reporter Marco Luchetta, 41, cameraman Dario D’Angelo, 41, and technician Alessandro Otta, 37, were killed in a Bosnian Croat mortar attack Friday in the Muslim-held quarter of Mostar.

“We hope Croatia’s government will join in the condemnation of such an appalling incident,” Andreatta said in a letter to his Croatian counterpart, Mate Granic. “Italy also expects all parties to collaborate fully in identifying who was responsible.”