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A US government report on sightings of unidentified flying objects (UFOs) found no evidence of alien activity but does not rule it out, officials have told US media.

The review of 120 incidents is expected to conclude that US technology was not involved in most cases.

But beyond that, the report makes no definitive assessments about what the objects might be, officials said.

A declassified version of the report is due to be handed to lawmakers in June.

The report is the product of a military task force established last year to investigate decades of unexplained aerial sightings in