NEW : Shelling in Hama causes a number of buildings to collapse , witness says . The Red Cross said Mohammed al-Khadraa , a Syrian Arab Red Crescent volunteer , was killed and three others were injured in Douma on Tuesday evening . They say fresh violence erupts in Douma and Hama after U.N. observers leave . Comment: Hillary Clinton : It is `` absolutely deplorable '' if the regime is killing those who spoke to monitors .
NEW : Shelling in Hama causes a number of buildings to collapse , witness says . They say fresh violence erupts in Douma and Hama after U.N. observers leave . Comment: Hillary Clinton : It is `` absolutely deplorable '' if the regime is killing those who spoke to monitors .