Steven Leon Mack

Authorities say Steven Leon Mack, 33, escaped April 28 from a federal halfway house in the city. (May 2, 2014)

Federal authorities said Friday they are seeking a convicted sex offender who is at large in the Baltimore area.

Steven Leon Mack, 33, escaped April 28 from a federal halfway house in the city and failed to contact the city's sex offender unit as ordered, according to Deputy U.S. Marshal David Lutz.

Originally convicted in New York in 2003 of sexual misconduct with a victim younger than 17, Mack was convicted in 2011 on a federal charge of failure to register as a sex offender.

He was charged again in October 2013 with failure to register in Baltimore City. Mack, described as 6 feet 2 inches tall and 190 pounds, is known to frequent homeless shelters, according to Lutz. Anyone who sees him is asked to call 911; anyone with information is asked to call U.S. Marshals at 410-962-3440.