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UNITED NATIONS (Reuters) - Sudan's U.N. ambassador on Friday dismissed as "irresponsible" U.S. allegations that weapons from northern Sudan were going to armed groups in the semi-autonomous south ahead of a nationwide April election.

Earlier this week the U.S. ambassador to the United Nations, Susan Rice, said Washington was concerned about the flow of arms, including heavy weapons, into southern Sudan, and believed they were coming from northern Sudan and neighboring countries.

Sudanese Ambassador Abdalmahmoud Abdalhaleem told Reuters that Khartoum "categorically denied" Rice's allegations.

"The statement by the U.S. ambassador to the U.N. attributing arms flows to south Sudan to the north is most irresponsible," he said in an interview.

"It demonstrates that Susan Rice is still imprisoning herself in the past and failed to move from an activist position to that of a worthy representative of a superpower."

He added that it was U.S. arms sales that were making the world less safe, not weapons from his oil-rich African nation.

U.N. officials have said privately that they, too, suspect the north was supplying southern militants with weapons.

The oil-producing nation's north and south fought each other for more than two decades until a 2005 peace deal that promised national elections, due in April, and a referendum on southern independence in January 2011.