The search for missing Long Hill resident David Bird continues for a second week.

The FBI has joined the search according to Fox News, which reports that there is no evidence to suggest foul play but "it hasn't been ruled out."

Over the weekend investigators focused on railroad tracks in the Millington section of Long Hill according to the Star Ledger but there were no new developments. His family, however, maintains a positive outlook and says the national attention to the case has helped.

"The more people we can make aware of David's disappearance, the better. If people know about David and are keeping their eyes open for him, we're hoping that'll increase the chances he's found," a family friend told NJ.com.

Bird disappeared on Saturday, Jan. 11 after leaving his home to take a walk. Teams of police have searched rivers, fields and yards all week in an effort to locate the 55-year-old who has not taken his medication for a liver transplant.

NBC News last week reported that records show one of Bird’s credit cards has been used in Mexico; and some family members suspect his disappearance may be tied to his coverage of OPEC.

Bird was wearing a bright red jacket, blue jeans, sneakers and glasses when he was last seen. Bird is described as a balding white male with a gray goatee and gray hair, 6’1 tall.

Anyone with information about Bird is asked to phone 908-647-1800, Option 1, Ext. 236.

MORE COVERAGE: