ARUNDEL — An unidentified man robbed Infinity Federal Credit Union at gunpoint this morning shortly after it opened.

The suspect entered the Alfred Road bank around 9:30 a.m. and escaped with an undetermined amount of money. No employees or customers were injured in the incident.

York County Sheriff’s Office is investigating the robbery. Authorities said they do not know if the suspect had an accomplice.

The FBI is assisting in the investigation, as they frequently do with bank robberies, according to the sheriff’s office.

Authorities didn’t immediately release many details.