U.N. monitors arrived in Syria Monday morning during a cease-fire that began Thursday, according to CNN.
A decision was made Saturday by the U.N. Security Council to send representatives to monitor the cease-fire.
There have been signs that the cease-fire is on the brink of collapsing, according to CNN, and the council means to send over 250 observers depending on the success of the initial group.
Opposition to the Syrian government reported Sunday that the city of Homs is still being attacked by helicopters, and 23 people died across Syria Sunday, according to the Local Coordination Committees of Syria.
The Syrian regime said it was "armed terrorists" who violated the cease-fire.