A Thai riot soldier wears a gas mask at the Government House in Bangkok, Thailand, on March 16. Tens of thousands of protesters pressed ahead with a mass rally in Bangkok on Tuesday, some expressing frustration that four days of peaceful protests had failed to force Thailand's premier to call elections. Leaders of the 'red shirts' collected blood from supporters which they spilled outside the gates in what they are calling a symbolic sacrifice for democracy.

Chaiwat Subprasom/Reuters