LONDON - Syrian government forces are killing civilians in organized attacks on towns and villages that amount to crimes against humanity, Amnesty International said on Thursday, citing evidence from over 20 locations in the country's northwest.

The rights group repeated its call for the United Nations Security Council to refer Syria to the prosecutor of the International Criminal Court, and to impose an arms embargo.

Amnesty's findings, detailed in a 70-page report, add to reports of massacres elsewhere in Syria as a 15-month-old uprising against President Bashar Assad moves closer to a civil war.

Please LIKE our Facebook page - it makes us stronger