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.

Fire breaks out at Kuwaiti refinery after drone attacks
Four countries condemn Iranian attack on Ras Laffan in Qatar
Trump compares Pearl Harbour to strikes on Iran in meeting Japan's leader
Netanyahu says Iran no longer has uranium enrichment capacity
US objectives in Iran have not changed, says Hegseth
