The Obama administration is offering up to $10 million for information leading to the capture of two men convicted of killing an American diplomat in Sudan five years ago.

The State Department on Tuesday also declared Abdelbasit Alhaj Alhassan Haj Hamad and Mohamed Makawi Ibrahim Mohamed as global terrorists. The action blocks any assets they have in the U.S. and bans Americans from doing business with them.

Abdelbasit and Makawi were among four in Sudan sentenced to death for the drive-by shooting of John Granville, a 33-year-old diplomat from Buffalo, N.Y., and his driver in Khartoum on Jan. 1, 2008.

The State Department says Abdelbasit shot Granville and Makawi killed the driver.

In 2010, both men escaped from Sudan's national prison through a sewage pipe. They remain at large.