Yemen unrest: 'Panic and chaos' in Sanaa
At least 17 people have been killed in a government assault on protesters in the Yemeni capital, Sanaa, reports say.
Witnesses said the demonstrators came under attack in Sanaa's Change Square - the focus of months of protests.
New York Times journalist Laura Kasinof is in Sanaa and told the BBC that protesters spoke of "panic and choas" during the attack.