Coordinated bomb attacks in the city of Sungai Golok, southern Thailand, on Sept. 16 killed four people and injured more than 50. Three timed explosions occurred near two hotels and a cultural center.
Separatists have been attacking both government and civilian targets since 2004, killing more than 4,700 people. From February to September 2011, the attacks grew more sophisticated and resultant casualties increased. There has also been a shift to more public and commercial targets where foreign travelers might group.