QUETTA, Pakistan (AP) -- A suicide bomber blew himself up at a train station in restive southwestern Pakistan on Saturday, killing at least 24 people, including security officers, and wounding about 50 others, some critically, officials said.

The attack happened when nearly 100 passengers were waiting for a train to travel to the garrison city of Rawalpindi from Quetta, the capital of the restive Balochistan province, according to Hamza Shafqaat, a senior government administrator.