Yala, Jan 28 (Agencies): Four people were killed, including a security volunteer collecting her two-year-old daughter from a day care, in separate attacks in Thailand's insurgency-hit south, police said on Friday.

Unknown assailants with gun targeted the 37-year-old Buddhist woman in front of her child and two Muslim men were killed in separate drive-by shootings in Pattani province on Thursday.

In another gun attack in Yala province on the same day, a 35-year-old Muslim security volunteer was killed at his home.

Shadowy Islamic insurgents have been showing its ugly face, with an unusually brazen attack by armed militants on a Thai military base in Narathiwat province last week killing at least four soldiers.

A Buddhist monk and three troops escorting him to collect alms were injured on Friday when a homemade bomb hidden at the foot of a bridge in Pattani was detonated by radio.

Rebels have started a violent campaign in Thailand's southernmost region bordering Malaysia since early 2004, leaving more than 4,400 people dead, including both Muslims and Buddhists.

Thailand extended emergency rule last week in most of areas containing the Muslim majority for another three months, despite rights groups' concerns about the powers given to the military.