Washington police detectives continue to search for leads in two armed robberies committed within a three-day period.

While investigators are looking at some possible suspects, they lack enough evidence at this time to seek charges in the holdups, according to Detective Sgt. Steve Sitzes.

“We’re kind of in a holding pattern at this point,” Sitzes told The Missourian Tuesday.

Last week, police announced that a $1,000 reward is being offered for information leading to the arrest and conviction of a suspect or suspects in the crimes.

A lone robber wielding a large kitchen knife got away with an undisclosed amount of cash Saturday night, Sept. 14, after threatening a clerk at the Fischer Phillips 66 gas station at Fifth and Elm streets.

Late Tuesday night, Sept. 17, two men believed to be in their late teens or early 20s, entered the Fas-Trip BP gas station at Highway 47 and Fifth Street and demanded cash from a clerk on duty. One of the men displayed a long knife. After they were given cash from the register, the two left the store and were last seen crossing Fifth Street on foot toward the Mercy Hospital parking lot, according to reports.

It’s believed to be the first time that back-to-back armed robberies in Washington were committed in that short of a period of time.

In both cases, the suspects wore bandanas to hide their faces and baseball caps.

The robbery at the Fas-Trip station occurred at about 11:52 p.m. Tuesday, according to the time on a suveillance video obtained by police.

Sitzes said when the one suspect with the knife announced a holdup and demanded cash, the clerk said she would have to complete a transaction with a customer before she could access the register. The suspects waited about 30 seconds then were given the money.

Sitzes said there were four customers as well the cashier in the store at the time.