The U.S. government is offering a $5 million reward for information leading to the capture of escaped Mexican drug kingpin Joaquin "El Chapo" Guzman.

The acting head of the Drug Enforcement Administration, Chuck Rosenberg, also says a tip-line for information about Guzman is being established.

Guzman escaped from one of Mexico's most secure prisons last month via a sophisticated mile-long tunnel that opened up in his cell's shower.

Mexican authorities have announced a $3.8 million reward for the drug kingpin, who's believed to have a net worth of about $1 billion.

Guzman was arrested in February 2014 in a seaside resort town after about 13 years on the run since his last prison break, in 2001.