PORTAGE, In. (WDRB) -- Indiana State Police have issued a Silver Alert for a missing 80-year-old man.

Police say Frank Komenda is missing from Portage, Indiana, which is 16 miles northwest of Valparaiso.

Komenda was last seen Saturday morning at 11:30 in Portage.

Police describe Komenda as a white male. He's 5 feet 11 inches tall, weighs 220 pounds and has gray hair and hazel eyes.

Officials say when last seen, he was wearing a brown "Carhart" jacket with a hood, a black stocking cap and jeans.

Investigators say Komenda is believed to be in danger and may require medical attention.

Authorities say he may be driving a 1995 turquoise Ford F-150 with a matching canopy. The vehicle's Indiana license plate number is SYI205.

Anyone with information about Komenda's whereabouts is asked to call the Portage Police Department at 219-762-3122 and select option 1.

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