Protests continue in Syria (26 images)

Smoke is seen rising from Bab Amro near Homs as government forces continue to bomb the rebel areas in Syria on February 15, 2012. Syria's President Bashar al-Assad has called for referendum on a new constitution that would effectively end nearly five decades of single party rule, it was announced today. UPI

Syrian residents stay in a shelter in the district of Bab Amro in Homs as government forces continue to bomb the rebel areas in Syria on February 15, 2012. Syria's President Bashar al-Assad has called for referendum on a new constitution that would effectively end nearly five decades of single party rule, it was announced today. UPI

A Syrian tank is seen in Bab Amro near the city of Homs, Syria on February 14, 2012. Syrian government forces renewed their assault on the rebellious city of Homs Tuesday in what activists described as the heaviest shelling in days, as the U.N. human rights chief raised fears of civil war. UPI

Shows smoke rising from a building reportedly following shelling by the Syrian army in the Bab Amr neighborhood of Homs, Syria on February 14, 2012. Syrian government forces renewed their assault on the rebellious city of Homs Tuesday in what activists described as the heaviest shelling in days, as the U.N. human rights chief raised fears of civil war. UPI