Two Canadians arrested in eastern Montana have pleaded guilty to trying to smuggle an estimated $5.5 million US worth of ecstasy pills into the United States.

The seizure of nearly 224,000 pills last February was believed to be the state's biggest bust for ecstasy, a hallucinogen and stimulant.

Winnipeggers Alan J. Mulder and Christian D. Laurin pleaded guilty Tuesday in U.S. District Court in Billings, Mont., to conspiracy to possess the drug for distribution. Sentencing is scheduled for April.

A jury trial for Timothy M. Morneau, 32, also of Winnipeg, is scheduled to start Monday.

The three were arrested Feb. 9 in Glendive, Mont., after a Montana Highway Patrol trooper stopped their vehicle on Interstate 94 for having a headlight out.

Officers found ecstasy pills in a duffel bag in the trunk.