President Trump’s campaign website was briefly taken over by hackers who defaced the site on Tuesday.

The defacement lasted less than 30 minutes, but the incident came as Mr. Trump’s campaign and that of his opponent, Joseph R. Biden Jr., as well as law enforcement and intelligence agencies, have been on high alert for digital interference ahead of next week’s election.

In a statement, Tim Murtaugh, a spokesman for the Trump campaign, confirmed the website’s defacement and said it was “working with law enforcement authorities to investigate the source of the attack.” He added, “There was no exposure to sensitive data because none of it is actually stored on the site. The website has been restored.”

The F.B.I. did not immediately comment on the incident. The defacement was first noted on Twitter by Gabriel Lorenzo Greschler, a journalist at the Jewish News of Northern California, while he was researching an article on climate change.

It was not clear whether the defacement was the work of foreign hackers or cybercriminals. But in a screed posted to Mr. Trump’s website — donaldjtrump.com — the hackers claimed to have compromised “multiple devices” that gave them access to the “most internal and secret conversations” of the president and his relatives, including classified information.

The hackers also accused the Trump administration, without proof, of having a hand in the origins of the coronavirus and cooperating with “foreign actors manipulating the 2020 elections.”

The hackers appeared to be looking to generate cryptocurrency. They invited visitors to donate cryptocurrency to one of two funds — one labeled “Yes, share the data,” the other labeled “No, Do not share the data.” They solicited payments in Monero, a hard-to-trace cryptocurrency.

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