The BBC has a report, with video, of today’s clash between the red shirts and security forces near National Monument.

Thai troops and a convoy of hundreds of red-shirt protesters have clashed on the outskirts of Bangkok. One soldier has died, reportedly from a shot fired by a member of the security forces, and at least 10 people have been injured. The protesters had earlier left their fortified camp in central Bangkok to drive to a rally 50km (30 miles) away.

Irrawaddy reports:

The confrontation was chaotic and at one point security forces fired on a group of troops riding toward them on motorbikes in what appeared to be an accident, although some members of the security forces have been accused of siding with the protesters. At least four motorbikes crashed and one soldier was carried away on a stretcher, bleeding profusely from the head. Several others from the group threw their hands in the air.