The Red Cross has expressed alarm over the situation in the besieged Syrian town of Qusair, and has appealed for immediate access to deliver aid, BBC News reported.

Thousands of civilians are believed to be trapped as pro-government forces battle rebels, with medical supplies, food and water scarce.

Russia earlier blocked a UN "declaration of alarm" on Qusair.

In Syria on Sunday, June 2 at least three people were reportedly killed by a car bomb in a Damascus suburb.

The blast, in the district of Jobar, appeared to target a police station, according to the UK-based pro-opposition Syrian Observatory for Human Rights.

Reuters news agency quoted a Lebanese security source on Sunday as saying that at least 15 people were also killed in overnight fighting between Hezbollah fighters and Syrian rebel forces in Lebanon's eastern town of Baalbek. The casualties have not been independently verified.