Hundreds of police and soldiers enforced a strict curfew Tuesday that confined most residents of the capital to their homes after a homemade bomb killed seven people at a governing party meeting.

The government said it imposed the curfew in Colombo and surrounding areas because of reports the People's Liberation Front, a radical Sinhalese group, was planning an all-day work stoppage. A government statement spoke of fears such a strike would trigger more violence.Police initially blamed the front for the Monday night bombing at a Colombo home where members of President Junius R. Jayewardene's United National Party, also predominantly Sinhalese, were meeting.

But party officials said Tuesday they had not ruled out the possibility the bomb was the work of opposition political parties.