Thailand authorities say two bomb blasts Sunday in the country's restive south wounded 21 people, including four soldiers.

Local authorities say the first bomb exploded during a football match in a village in Yala province, wounding 17 players and spectators.

Hours later, in Narathiwat province, a roadside bomb wounded four soldiers on a foot patrol.

Thai security forces are on high alert since Thursday, when militants in Yala province killed at least 11 government-hired paramilitaries.

While Thailand has a Buddhist majority, the south is dominated by Muslims.

At least 2,200 people have died since 2004 in near-daily violence in the region. Authorities attribute much of the unrest to Islamist separatists.

Some information for this report was provided by AFP, AP and Reuters.