AMMAN, May 27 (Reuters) - Syrian forces shot dead at least two men on Sunday as protests broke out to condemn a massacre that killed at least 109 civilians in the town of Houla, opposition activists said.

The two were killed in the Damascus suburbs of Yalda and Daraya, home to thousands of refugees who have fled a military crackdown on the central province of Homs.

Activists said forces loyal to President Bashar al-Assad killed at least 109 people, mostly women and children, on Friday, in one of the biggest massacres of the 14-month uprising against his rule. (Reporting by Khaled Yacoub Oweis, Amman newsroom; Editing by Janet Lawrence)