As many as 2,000 Guatemalan soldiers have been deployed near the border with Honduras and Mexico in a bid to improve security.
This comes after three soldiers were gunned down last week after a group of suspected drug traffickers ambushed a patrol in Izabal province.
The attack had prompted lawmakers to authorise a 30-day emergency decree that imposes a night-time curfew in the six northeastern provinces that make up a drug-trafficking corridor along the border.
The decree also gives the military new powers to arrest and interrogate suspects and prohibits organized protests in the targeted areas.
"We expect them to bring calm, security and peace to the people of this region," Defence Minister Luis Miguel Ralda said.

Trump backs down on Greenland tariffs, says deal framework reached
Train crashes into crane in southeastern Spain, several injured
New Zealand rescuers seek landslide survivors as weather havoc kills two
3 people shot dead in eastern Australia, town in lockdown
Death toll in Karachi mall fire climbs to around 50, official says