A top Republican on the House Homeland Security Committee is accusing the Navy of withholding information about reports of unidentified aircraft after officially requesting more data on the mysterious encounters.

Rep. Mark Walker of North Carolina, the ranking member of the Intelligence and Counterrorism subcommittee, asked Secretary Richard V. Spencer in July to outline what resources the Navy is dedicating to investigating the sightings. He also asked if officials have found "physical evidence" to substantiate the claims, and whether they are aware of any foreign nations or private companies that have introduced breakthrough technologies that could explain them.

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