Thai police say at least 22 people have been wounded by an explosion that went off in Bangkok during a march of anti-government protesters led by opposition leader Suthep Thaugsuban.
Authorities say the blast occurred after 1 p.m. in the capital on Friday. Television footage showed several protesters covered in blood, but here have been no immediate reports of deaths.
Protesters were seen searching nearby buildings for the unidentified attackers, while ambulances rushed the wounded away. Police are investigating what type of explosive caused the blast.
There has been a series of drive-by shootings that protesters blame on the government.
Protest leader Suthep is calling for an unelected people's council to replace the current government, which he says is corrupt and engages in nepotism.
Prime Minister Yingluck Shinawatra has refused to step down. She insists on holding early elections on February 2, though the opposition has said it will boycott the polls.