Updated

The special U.S. House election in an upstate New York congressional district is now exactly tied.

Democrat Scott Murphy and Republican Jim Tedisco have 77,225 votes each, according to the New York Board of Elections.

Murphy previously was leading Tedisco by 25 votes, but that lead narrowed as officials conducted a mandatory check of voting machine results.

John Conklin, spokesman for the state elections board, told FOXNews.com the outcome of the race will not be known for "several weeks at least."

"The lawyers are now involved, so everything will get much slower," he said.

Conklin said officials probably will begin Tuesday counting the absentee ballots, more than 10,000 of which were sent out.

He said a recount, though not mandatory under New York law, is a possibility.

The election in the 20th Congressional District was held to select a replacement for Kirsten Gillibrand, who replaced Hillary Clinton in the U.S. Senate when Clinton took over as secretary of state.