MOSCOW (AP) _ Since a fatal bombing in Moscow nearly two weeks ago, police have launched an anti-terror operation that has confiscated 136 tons of explosives, according to an Interior Ministry official.

Police also detained 408 criminal suspects, said Lt. Gen. Alexander Chekalin, head of the ministry's public order department, the ORT television channel reported Sunday.

But the detentions are apparently unrelated to the Aug. 8 attack in which a bomb tore through a passage under Moscow's busy Pushkin Square, killing 12 people. Police have reported no breakthrough in that investigation.

The report did not give details on who had the explosives or why the quantity seized was so large.