Officials say at least 30 inmates are dead after what appears to have been coordinated riots in several Guatemalan prisons Monday. 

The prisoners, reported to be members of rival street gangs, attacked each other with knives, guns and grenades.

Police intervened to stop the fighting which left more than 60 people injured.

The riots broke out in at least three prisons, including Pavon, El Hoyon and Canada.

Some information for this report provided by AP, Reuters.