Syrian security forces have reportedly killed seven people, including a woman, and arrested more than 150 others over the past 24 hours in a Damascus suburb.The activists said that four people were killed in the protest hub of Homs in central Syria and two demonstrators were killed in Talbisseh, north of the city, by security forces on Wednesday.The Britain-based Syrian Observatory for Human Rights said that a 28-year-old woman who was arrested a week ago, died under torture in the city of Khan Shehoun on Thursday.Military and security forces arrested 27 people in the Harasta suburb of Damascus on Wednesday after sealing off the district and arresting 120 people the previous day, the Observatory added.