BEIRUT, Lebanon — Even as a United Nations human rights team was investigating the violence in Syria, activists said Tuesday that security forces killed at least five more civilians in an assault on the suburbs of Hama, one of the country’s most restive cities.

The team was sent by the United Nations Human Rights Council to investigate what it has called “systematic human rights violations” in the government’s attempt to crush five months of protests challenging President Bashar al-Assad’s grip on power. Activists said Tuesday that among those killed were three women caught in raids on al-Ghab plain, a stretch of farmland in the northwest.

It was an eventful — if increasingly routine — day in Syria, where the government tried to project an image of control and calm by once again unleashing its security forces even as civilians continued to demonstrate that the use of lethal force could not quell their uprising.

The United Nations says at least 2,200 people have been killed in Syria since the revolt began in mid-March.