RUSSIANS FEELING UNEASY AFTER TROLLEY BOMBING INJURES 30.

Byline: The New York Times

Fear and anger swept across the Russian capital Friday after a second bomb in less than 24 hours tore through a trolley bus in Moscow at the height of the morning rush hour.

The blast, which sent 30 passengers to the hospital, blew a hole in the top of the bus and sent glass shards and twisted metal flying across the crowded roadway. Somehow, no one was killed.

The explosion, caused by a bomb left in a black bag under an empty seat, was identical to one that wounded six people and destroyed a trolley Thursday morning. By Friday night, Moscow police had reported more than 60 bomb threats, a record, although no other bombs were discovered.

President Boris Yeltsin immediately denounced the attacks, and saying the city was ``infested with terrorists,'' ordered 1,000 elite soldiers onto the streets. By noon the soldiers, armed with automatic weapons, were stationed at strategic positions like bridges and major highways while uneasy commuters were driven underground to the subways.

Although nobody claimed responsibility and there is no evidence to suggest who is behind the bombings, Moscow Mayor Yuri Luzhkov gave voice to the widely held belief that the attacks are reprisals for newly stepped-up Russian aggression in secessionist Chechnya.

``We are witnessing a system of terrorist acts,'' the burly, outspoken mayor said Friday morning at the scene on Prospekt Mira, about three miles north of the Kremlin. ``We are going to have to do something about the whole Chechen diaspora in this city.''

It is not the practice in Russia to claim responsibility for terrorism or other acts of violence like the bombings. No one has come forward in the Thursday bombing near Pushkin Square or a subway explosion June 11 that killed four people.