
Yemeni anti-government protesters shout slogans during a protest demanding the ousting of Yemeni President Ali Abdullah Saleh, in Sana’a, Yemen, 16 October 2011. According to media reports, at least four Yemeni protesters were killed and dozens others injured when security forces loyal to Yemen president Ali Abdullah Saleh and snipers shot dead anti-government protesters as they were heading towards streets run by the government forces in Sana’a. EPA/YAHYA ARHAB

Yemeni anti-government protesters shout slogans during a protest demanding the ousting of Yemeni President Ali Abdullah Saleh, in Sana’a, Yemen, 16 October 2011. According to media reports, at least four Yemeni protesters were killed and dozens others injured when security forces loyal to Yemen president Ali Abdullah Saleh and snipers shot dead anti-government protesters as they were heading towards streets run by the government forces in Sana’a. EPA/YAHYA ARHAB

Yemeni anti-government protesters march to demand the ousting of Yemeni President Ali Abdullah Saleh, in Sana'a, Yemen, 16 October 2011. According to media reports, at least four Yemeni protesters were killed and dozens others injured when security forces loyal to Yemen president Ali Abdullah Saleh and snipers shot and killed anti-government protesters as they were heading towards streets manned by government forces in Sana'a. EPA/YAHYA ARHAB

Yemeni anti-government protesters shout slogans during a protest demanding the ousting of Yemeni President Ali Abdullah Saleh, in Sana'a, Yemen, 16 October 2011. According to media reports, at least four Yemeni protesters were killed and dozens others injured when security forces loyal to Yemen president Ali Abdullah Saleh and snipers shot and killed anti-government protesters as they were heading towards streets manned by government forces in Sana'a. EPA/YAHYA ARHAB

Defected Yemeni soldiers stand guard at a checkpoint as anti-government protester march to demand the ousting of Yemeni President Ali Abdullah Saleh, in Sana’a, Yemen, 16 October 2011. According to media reports, at least four Yemeni protesters were killed and dozens others injured when security forces loyal to Yemen president Ali Abdullah Saleh and snipers shot dead anti-government protesters as they were heading towards streets run by the government forces in Sana’a. EPA/YAHYA ARHAB EPA/YAHYA ARHAB

Yemeni anti-government protesters march to demand the ousting of Yemeni President Ali Abdullah Saleh, in Sana'a, Yemen, 16 October 2011. According to media reports, at least four Yemeni protesters were killed and dozens others injured when security forces loyal to Yemen president Ali Abdullah Saleh and snipers shot and killed anti-government protesters as they were heading towards streets manned by government forces in Sana'a. EPA/YAHYA ARHAB

Yemeni anti-government protesters shout slogans as they march to demand the ousting of Yemeni President Ali Abdullah Saleh, in Sana'a, Yemen, 16 October 2011. According to media reports, at least four Yemeni protesters were killed and dozens others injured when security forces loyal to Yemen president Ali Abdullah Saleh and snipers shot dead anti-government protesters as they were heading towards streets run by the government forces in Sana'a. EPA/YAHYA ARHAB