108 killed in Syrian massacre, UN's human rights office says

May 28, 2012: This frame grab made from an amateur video provided by Syrian activists on purports to show the massacre in Houla on May 25 that killed more than 100 people, many of them children. The amateur footage shows people running along a street, purportedly just after the attack on Houla started. (AP/Amateur Video)

May 26, 2012: This citizen journalism image provided by Shaam News Network taken Saturday purports to show a dead child following a Syrian government assault on Houla, Syria. (AP)

May 26, 2012: This citizen journalism image provided by Shaam News Network taken Saturday purports to show dead bodies following a Syrian government assault on Houla, Syria. (AP)

May 28, 2012: This frame grab made from an amateur video provided by Syrian activists on Monday purports to show the massacre in Houla on May 25 that killed more than 100 people, many of them children. (AP/Amateur Video)

May 28, 2012: This frame grab made from an amateur video provided by Syrian activists on purports to show the massacre in Houla on May 25 that killed more than 100 people, many of them children. The amateur footage shows people running along a street, purportedly just after the attack on Houla started. (AP/Amateur Video)

May 26, 2012: This citizen journalism image provided by Shaam News Network taken Saturday, purports to show shrouded dead bodies following a Syrian government assault on Houla, Syria. (AP)

May 26, 2012: Residents shout as they gather around a vehicle carrying United Nations observers in Houla, near Homs in this handout dated May 26, 2012. (REUTERS/Shaam News Network)

People gather at a mass burial for the victims purportedly killed during an artillery barrage from Syrian forces in Houla in this handout image dated May 26, 2012. (REUTERS/Shaam News Network)