Jessica Heeringa Update: Police seek man in connection with missing Mich. mom case, release sketch

(CBS) - Police in Norton Shores, Mich., have released a sketch of a man they're seeking in connection with the disappearance of a 25-year-old mother, reports CBS affiliate WWJ.

PICTURES: Mich. mom vanishes from gas station

Police say Jessica Heeringa, a gas station clerk, disappeared from the Exxon Mobil station where she worked on Friday. Police are investigating the case as an abduction.

A man who called 911 shortly after 11 p.m. Friday reported the gas station was empty, though the door was unlocked and he saw te clerk's purse. There was apparently no sign of a struggle, police have said.

Police are searching for a gray minivan that was seen driving away from the station Friday night. The driver is being described as a white man, about 30 to 40 years old, about 6 feet tall, with light brown wavy hair.

A second video surveillance clip of what police believe is the van is expected to be released Wednesday, MLive reports.

The new video was taken from Coin Zone on Grand Haven Road, reports the website. A first video released was from The Old Homestead Tavern, about a mile from where Heeringa was allegedly abducted.

Norton Shores Police Chief Daniel Shaw said Tuesday it gets harder as time passes to solve the case. But he said investigators continue to pursue leads and examine limited evidence.

Police described Heeringa as 5-foot-1 and about 110 pounds.

Anyone who may have witnessed suspicious activity near the Exxon Mobil gas station in Norton Shores, Mich. is asked to contact Silent Observer at 231-72-CRIME (231-722-7463) or call 911. 

Complete coverage of the Jessica Heeringa disappearance on Crimesider