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 .
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 . Syria is not accepting monitors from Friends of Syria nations , a U.N. official says . Hillary Clinton : It is `` absolutely deplorable '' if the regime is killing those who spoke to monitors .