Shooting and tear gas in Yemen unrest
19 September 2011 Last updated at 13:02 BST
Government forces have opened fire for the second day in a row in the Yemeni capital, Sanaa.
At least 20 people have been killed, doctors say, in the crackdown which began on Sunday.
Snipers in Sanaa fired from rooftops at a protester camp, killing bystanders including a child, witnesses said.
And government forces have begun shelling areas held by soldiers loyal to the protesters, reports say.
Mike Wooldridge reports.