Sept. 20 (UPI) -- Police in South Africa have seized crystal methamphetamine worth around $20 million at a lab on a rural property, according to law enforcement officials.

Authorities also collected weapons and cash while dismantling the clandestine drug manufacturing operation, located on a farm in the eastern part of the country.

Six people were arrested, five of which are from a "North American country," police said in a statement. Two other suspects were able to elude police.

"Preliminary investigations revealed that the five foreign nationals in custody were in the country illegally. They are facing possible charges related to contravening the Drugs and Drug Trafficking Act as well as the Immigration Act," police said in the statement.

Authorities said they were led to the laboratory by an anonymous tip.