A flight from Los Angeles to London was diverted to Boston early Tuesday because three Pakistani passengers were acting suspiciously, but nothing amiss was found and the three were released after questioning, authorities said.

United Airlines (search) Flight 934 landed in Boston shortly before 3 a.m., Logan Airport (search) spokesman Phil Orlandella said. Three people he described as Pakistani citizens were taken into custody and questioned.

All three were later released and no charges were filed, said Gail Marcinkiewicz, a spokeswoman for the FBI in Boston.

"The flight crew made an observation of their behavior which caused the flight to be diverted to Boston," she said. "It's all being resolved. They will be on another flight this morning for Heathrow (search)."

Flight 934 is expected to depart for London later in the morning.

Police searched the aircraft and found nothing suspicious, Orlandella said.

State trooper Veronica Dalton said the three passengers had been "acting suspiciously and making the passengers nervous."

"The crew made the determination that they were going to land the plane in Boston," she said.

The three passengers were not identified.