Two people were arrested Monday after police discovered more than 1,200 pounds of liquid methamphetamine inside the fuel tank of their semi truck.

The incident happened on October 22nd in Norman, Oklahoma.

Police say that officers with the 21st Judicial District Attorney Drug and Violent Crime Task Force were given a tip regarding a suspicious semi truck stopped in the parking lot of a hotel at the 100 block of 26th Avenue SW, prompting the team to investigate.

Upon inspection of the rig, officers discovered 1,262 pounds of liquid meth in the diesel fuel tank on the passenger side of the tractor trailer, making it one of the largest drug seizures in the state of Oklahoma at a street value of around $4.4 million, reported Koco 5 News.

The 36-year-old truck driver, Enrique Lara, and his 21-year-old passenger, Jasmine Morales, were then arrested on charges of aggravated trafficking and taken to the Cleveland County detention center.

Officials are still investigating the incident.