LONG HILL — A massive search for a liver transplant patient who may have gone days without his medication continued Monday morning, as police and rescuers from several agencies combed the Long Hill area for the 55-year-old man.

David Bird went missing after 4 p.m. on Saturday, when he left his Millington residence on Long Hill Road on foot, Long Hill Police Lt. Ahmed Naga told NJ.com this weekend. Naga said a family member reported Bird missing after he failed to return from his walk, and that the search began Saturday night.

Long Hill Police said on their Facebook page they've gotten reports of Bird being spotted twice in Warren and Bernards Township, and maybe walking in the area of Bernards Township, Warren Township and Long Hill Township.

Because of his medical condition, he may be confused and disoriented. He is not dangerous, police said.

Bird is described as a white male, 6 feet and 1 inches in height, approximately 200 pounds, partially balding with gray hair and a gray beard. He was last seen wearing a distinct bright red jacket with two yellow zippers, police said.

Bird is known for walking the trails on Hicks Tract in Millington, police said.

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More than 200 people from several agencies were involved in the search Sunday, but stopped for the day after nightfall.

Monday morning, an emergency operations center opened at 7 a.m., and search teams met for a briefing an hour later, according to posts from Long Hill Police.

A State Police aviation unit will be flying low overhead around Millington, Basking Ridge, and Warren Township mid-day Monday, police said. The Morris County Sheriff's Office K9 Unit is conducting field searches, and the Morris County Underwater Rescue and Recovery Team will be conducting water search operations, police said. A Daily Record story quoted Police Chief Michael Mazzeo saying Parsippany Rescue and Recovery Dive Unit is also searching the Passaic river Monday morning.

Police said there is also a "large amount of ground personnel" searching areas in Millington and Stirling.

"We cannot thank everyone enough for helping us locate Mr. David Bird," police said in a Facebook post.

Police are asking anyone who sees someone matching Bird's description to contact the emergency operations center at 908-647-1800, Opt. 1, Extension 236.