BEIRUT, Lebanon (AP) _ Four suspects alleged to be working for Israeli intelligence have been arrested in connection with a bombing that killed a Muslim fundamentalist guerrilla, an army spokesman said Wednesday.

The Muslim fundamentalist group Hezbollah and the Lebanese government blamed Israel for the Dec. 21 blast in an Islamic neighborhood of Beirut that killed four. Israel has declined comment on the allegation.

The dead included Fuad Mughniyeh, whose brother Imad Mughniyeh is security chief for the pro-Iranian Hezbollah and is accused of masterminding the kidnapping of Western hostages in Beirut in the 1980s.

In a statement carried by state-run National News Agency, the army spokesman said the prime suspect in the bombing, Ahmed Hallaq, escaped and is believed to have fled to Israel.

Hallaq's wife, Hanan Yassin Hallaq, was arrested as she prepared to leave for Cyprus with her children and another suspect, Wafiq Nasser, said the spokesman, who was not identified. The other suspects were identified as Toufic Nasser and Suheil Homsy.

Hezbollah has been fighting Israeli occupation forces in south Lebanon. Israel has stepped up its threats of retaliaton against the guerrillas that target its forces.