Obama says U.S. appalled by Syria brutality, to work to isolate Assad

U.S. president says reports out of Hama are 'horrifying and demonstrate the true character of the Syrian regime'; Syrian army storms Hama, killing at least 100 civilians, according to activists.

''U.S. President Barack Obama said on Sunday he was appalled by the Syrian government's use of violence against its people in the city of Hama and promised to work with others to isolate Syrian President Bashar Assad.

Syrian tanks firing shells and machine guns stormed Hama on Sunday, killing at least 100 civilians, according to activists.

"The reports out of Hama are horrifying and demonstrate the true character of the Syrian regime," Obama said in a statement released by the White House.

"Syria will be a better place when a democratic transition goes forward. In the days ahead, the United States will continue to increase our pressure on the Syrian regime, and work with others around the world to isolate the Assad government and stand with the Syrian people."