UPDATE 12:38 p.m. EDT: The suspect has been identified as 26-year-old Wilbur Harwell, a third class petty officer, according to the Virginian-Pilot. As of noon, he had not been apprehended.

Original story:

A stabbing prompted a lockdown at a naval base in Virginia Friday morning as authorities continue to search for the perpetrator.

Officials told Norfolk ABC affiliate WAVY they knew the man's name and had a picture of him. The victim was a service member.

The base posted a description of the suspect on its Facebook page.

“Security forces are looking for a white male, 165 pounds, blonde hair, blue eyes, wearing tan cargo pants and a white shirt,” read a posting on the Facebook page for Naval Medical Center Portsmouth in Portsmouth. The medical center said anyone who spots a man with that description should call security at 757-953-5225.

The base said it went into lockdown around 9 a.m. 

“An incident has occurred on base that has caused security forces to close the gates. All staff and patients are to shelter in place. Monitor this page for further updates,” read another message on the Facebook page.

Authorities are unsure of the motive for the stabbing, according to the Norfolk Virginian-Pilot. Everyone on the base was ordered to shelter in place.