BEIRUT, July 15 (AP/UNB) — UN observers investigating Syria's latest reported mass killing say they found signs of a heavy assault that targeted specific homes of regime opponents.

The observers' statement Saturday was the first outsiders' look in the village of Tremseh, where activists say dozens were killed this week by government troops. The team says it could not yet confirm the toll.

The observer team says that it found pools of blood and blood splatters in several homes in Tremseh, along with bullet casings.

It says the attack "appeared targeted at specific groups and houses, mainly of army defectors and activists."

It says it confirmed an attack took place Thursday using artillery, mortars and small arms. The mission head had said Friday that observers stationed nearby witnessed government tanks and helicopters attacking Tremseh.