Country music star Willie Nelson and four others were issued misdemeanor citations for possession of narcotic mushrooms and marijuana after the tour bus they were on was stopped Monday morning on Interstate 10 in Louisiana, state police said.

In a news release, state police said the citations were issued after an early morning commercial vehicle inspection of the tour bus.

"When the door was opened and the trooper began to speak to the driver, he smelled the strong odor of marijuana," the news release said. A search of the bus produced 1 1/2 pounds of marijuana and 2/10 of a pound of narcotic mushrooms.

Cited along with the singer were Tony Sizemore, 59, St. Cloud, Fla.; Bobbie Nelson, 75, Briarcliff, Texas; Gates Moore, 54, Austin, Texas; David Anderson, 50, Dallas.

Each was released after being issued a citation.

A call to Nelson's publicist was not immediately returned.