From Reuters:

Zimbabean police on Thursday arrested two foreign journalists at a Harare hotel for covering the country's election without accreditation, police said.

"I can confirm that we have arrested two reporters at York Lodge for practising without accreditation," said police spokesman Wayne Bvudzijena, who added the police would identify them on Friday.

From the BBC:

The New York Times said its Pulitzer prize winning correspondent, Barry Bearak, had been arrested.

The newspaper said it did not know where he was being held, or if there were any charges against him.