NOGALES, Ariz. (AP) — The U.S. Border Patrol says agents found over a half-ton of abandoned marijuana after following footprints in a rural area near the U.S.-Mexico border.

Agents found 24 packages containing 1,100 pounds (499 kilograms) marijuana Monday after a canine team patrolling mountain roads east of Nogales, Arizona, found dozens of footprint impressions on a known smuggling route.

The agents then tracked the footprints to a wooded area a few miles away.

Agents removed the marijuana after determining that the smugglers were no longer in the area.

The Border Patrol says the marijuana was worth over $550,000.