We need the facts about where they are originating from, what their purpose is, and why their frequency is increasing," she said.

"We need the facts about where they are originating from, what their purpose is, and why their frequency is increasing," she said.

Democratic Senator Jon Tester, who represents Montana, told the BBC's US partner CBS: "What's gone on the last two weeks or so... has been nothing short of craziness. And the military needs to have a plan to not only determine what's out there, but determine the dangers."

Republicans have repeatedly criticised the Biden administration for its handling of the first suspected spy balloon, saying it should have been shot down far sooner.

Meanwhile, Defence Secretary Ben Wallace said the UK would conduct a security review following the recent incidents in the US and Canada. บาคาร่า88