Crime/ Familiar modus operandi

Mexican police found 10 decapitated corpses and 11 heads in a southwestern state that has become a major problem for President Enrique Pena Nieto since the apparent massacre of 43 trainee teachers there in September.

Several of the headless corpses found in graves about 50 kilometers (31 miles) east of the Guerrero state capital Chilpancingo showed signs of torture and had their hands tied, local security officials said on Wednesday.

The 11 severed heads were discovered in one grave, inside four black plastic bags, the Guerrero state prosecutor's office said in a statement. The identity of the victims was unclear.

Mexico's government is still investigating what happened to the missing students, who it says were abducted on the night of Sept. 26 by corrupt police in league with a drug gang in Iguala, the third biggest city in Guerrero.

Ten bodies and 11 heads found in violent Mexican state