A worker services an airBaltic plane in Riga, Latvia, May 13, 2010. REUTERS/Ints Kalnins A flight departing from Oslo, Norway, was delayed almost five hours after nearly all crew members failed a Breathalyzer test and were removed from the plane on Saturday.

109 passengers were aboard the airBaltic plane headed to Chania in Greece, reported AFP.

The crew members who exited the Greece-bound plane were the captain, first officer, and two flight attendants.

They were directed to a police car, and another airBaltic crew was assigned to replace those who were believed to be intoxicated.

"Results of the Breathalyzer tests confirmed that four of the five crew members ... were above the legal alcohol limit of 0.2 promille," Romerike police prosecutor Edith Ek Sorensen told AFP.

Passengers, however, were reportedly told that the pilot was "unwell," said the Dagbladet report. According to the Public Broadcasting of Latvia outlet LSM.tv, police arrived after receiving an anonymous tip from someone who implied the crew's "raucous" behavior was worth investigating.

An airBaltic spokesman, Janis Vanags, told LSM that the airline maintained a "zero tolerance" policy with regard to alcohol.

"Zero tolerance means no alcohol," Vanags said. "It's very straightforward — safety is our number one priority."

If the crew members are found to be in violation, they could face sentences of up to two years in prison, said AFP.

Soon after the incident, airBaltic issued this statement: