Reports Received In Prince George's, Frederick, Montgomery Counties.

Maryland and West Virginia officials said they've had no luck finding the source of a mysterious odor reported in both states.

MEMA director Richard Muth told WBAL-AM on Thursday that the number of reports about the smell had decreased but that the investigation continues.

West Virginia's state director of Homeland Security and Emergency Management said Maryland authorities alerted his office about a possible gas leak Wednesday.

Jimmy Gianato said people in Maryland were calling to report they'd smelled mercaptan. That's the substance added to natural gas to make it smell like rotten eggs.

Gianato said the state Department of Environmental Protection checked with gas facilities and pipelines on the West Virginia side, but no one reported any leaks.

Maryland's Department of Emergency Management said it received reports about the odor from Frederick, Prince George's and Montgomery counties.

A spokesman for the mayor's office in Baltimore said city and state officials, along with officials from BGE, are monitoring the reports.

Muth encouraged anyone who might notice what smells like a natural gas leak to call 911.