Aircraft collide over Alaska

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(WCJB) -- At least four people were killed and 10 others hospitalized after two aircraft collided in midair over Alaska on Monday, according to the U.S. Coast Guard.

Both planes were on sightseeing tours, carrying guests from the Royal Princess cruise ship, which was on a seven-day voyage that departed Vancouver on May 11 and was scheduled to arrive in Anchorage on Saturday, according to Princess Cruise Lines.

The Coast Guard, the FAA and the National Transportation Safety Board are all investigating the incident.