NEW : White House press secretary condemns Syrian government . At least 10 security forces were killed in Homs , state news agency says . 21 civilian deaths across Syria on Friday , activist said . Comment:
NEW : White House press secretary condemns Syrian government . At least 10 security forces were killed in Homs , state news agency says . 21 civilian deaths across Syria on Friday , activist said . Opposition figure Riad Seif is arrested , his wife says .