A masked man brandishing a rifle robbed a convenience store near Port Deposit on Wednesday night, police reported.
The suspect, who is considered to be armed and dangerous, remained on the loose as of late Thursday.
Police said the gunman walked into the Landhope Farms at 1252 Jacob Tome Highway about 9:30 p.m. and demanded money from a clerk standing behind the checkout counter.
"The suspect was brandishing a rifle with a scope in his right hand, but never pointed it at the employee or threatened her in any way," said Cpl. Todd Sexton, a Maryland State Police detective.
Sexton said the robber had concealed his physical features with various pieces of clothing.
"He was covered from head to toe. You could only see his eyes," Sexton said.
After the worker handed him money from the cash register, the gunman ran out the store, police said.
Several moments later, while some troopers searched for clues at the store, other troopers and Cecil County Sheriff's Office deputies searched the surrounding area, police added.
A sheriff's office K-9 unit was able to track the suspect's path to Theodore Road, about a half-mile northeast of the Landhope Farms, before losing his scent, according to Sexton.
Investigators attribute the lost scent to the possibility of the robber "entering a vehicle at that point," Sexton said.
A state police helicopter crew also made several passes over the area, but was unable to locate the suspect, police said.
The suspect is described as a white man, about 6 feet 4 inches tall and weighing between 250 and 270 pounds, police said.
He was wearing a dark hooded sweatshirt, blue jeans, black gloves and a camouflage mask which covered "his entire face except for a small portion of his eyes and nose," police added.
In addition to interviewing employees and patrons who witnessed the robbery, investigators have studied surveillance camera photos of the suspect.
Investigators said the suspect may be the same gunman who robbed a Royal Farms on Jacob Tome Highway near Port Deposit on Jan. 13, Sexton said.
"It's the same MO (method of operation), and same description," Sexton said.
Anyone with information that might help investigators identify and arrest the suspect in the Landhope Farms robbery is asked to call Sexton at 410-996-7862.