Airprox said aircraft safety had been compromised in 26 of the cases and there had been a risk of collision in nine other cases in addition to the three commercial air transport ones.

BBC: Jet in near miss mid-air collision

Washington RW Martin Erat was knocked out of the game by injury after a three-way collision with Ovechkin and Stepan.

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Hong Kong has observed three minutes' silence to mourn the 38 victims of Monday's fatal collision between two boats, as investigations continue.

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"As in 1998, more than three-quarters of the civil air transport incidents reported in the first half of 1999 were assessed as involving no risk of collision, " said Gordon McRobbie, director of the UK Airprox Board.

BBC: Jet in near miss mid-air collision