A cyber attack crippled the city of Pensacola over the weekend, just hours after a Saudi gunman killed three at naval base in the city.

Mayor Grover Robinson admitted Monday that officials do 'not yet don't know' if two incidents are 'connected or not'. The issue is thought to be ongoing.

'We have discussed and we have talked with the FBI. It's my understanding (the city) sent stuff to them, and we're continuing to work. Our computer people worked through the weekend to see what was happening', Robinson added.

Saudi Royal Air Force Second Lt. Mohammed Saeed al-Shamrani killed three and wounded eight others at Naval Air Station in Pensacola, Florida, on Friday.

The FBI Jacksonville tweeted Monday: 'The City of Pensacola has notified the FBI of a potential cyber related incident. We are providing resources to assist. No additional information is available at this time.'

It is understood the cyber attack began in the early hours of Saturday morning. A spokesperson for the city, Kaycee Lagarde, said it is 'too early to confirm or dispel' if it is related to the shooting.

She added: 'That would be a question for the federal agencies. As a precaution we have reported the incident to the federal government.'

Pensacola Mayor Grover C. Robinson IV speaks at a press conference following a shooting on the Pensacola Naval Air Base on Friday. Robinson spoke of an ongoing cyber attack Monday

Saudi Royal Air Force Second Lt. Mohammed Saeed al-Shamrani, pictured, killed three and wounded eight others at Naval Air Station in Pensacola, Florida, on Friday

A statement on the city's Facebook page read Monday: 'The City of Pensacola has experienced a cyber incident, and we have disconnected much of our city network until the issue can be resolved.

'Our IT Department is working diligently to resolve the issue. In the meantime, some city services have been impacted, including: City emails and phones, 311 customer service, online payments including Pensacola Energy and City of Pensacola Sanitation Services.'

The FBI is coming under increasing pressure to deliver answers on the motive behind the shooting at the U.S. Navy base on Friday morning.

The bureau said Sunday it will be investigated as a potential act of terrorism as authorities explore whether the gunman's sickening actions were spurred by a radical ideology.

He had visited the 9/11 memorial in New York just two days before shooting where he met up with at least five other Saudi airmen and was able to buy the Glock 9mm pistol he used in the shooting legally in Florida.

Authorities also believe the shooter authored a series of social media posts in which he talked about U.S. support for Israel and scolded Americans for being anti-Muslim.

After a trip home to Saudi Arabia in February, colleagues say he had become more religious, The New York Times reports.

In the hours leading up to the attack, the shooter appeared to have posted criticism of U.S. wars in the Middle East to social media, saying he hated Americans for 'committing crimes not only against Muslims but also humanity' and for the country's support of Israel.

He also posted a quote from assassinated al Qaeda leader Osama bin Laden, according to SITE Intelligence Group. The shooter's Twitter account was taken down subsequent to the attack.

As of Sunday, investigators had no indication that al-Shamrani was helped by others.

All computer communication systems at Pensacola City Hall, pictured, are down

Mayor Robinson said of the cyber attack: 'We're still trying to figure out what's happened, what's there and what there may be potential for.'

Much of the city's computer systems remained offline Monday morning. However, city officials stressed that all emergency services were running, including 911 services.

Some phone lines to city offices were not working as the city and federal authorities continued their investigation. The city's email and other electronic services were also down until further notice.

'We're continuing to operate. We just might have to do some things a little bit old-school, with pen and paper,' Lagarde said.

She could not immediately discuss how officials became aware of the cyberattack.

'We don't want to get into too many specifics because of security,' she said.

Investigators are trying to establish whether the killer, 2nd Lt. Mohammed Alshamrani, 21, of the Royal Saudi Air Force, acted alone or was part of a larger plot.

Family members and others identified the three dead as Airman Apprentice Cameron Scott Walters, 21, of Richmond Hill, Georgia (left); Airman Mohammed Sameh Haitham, 19, of St. Petersburg, Florida (center); and Joshua Kaleb Watson, a 23-year-old graduate of the US Naval Academy (right)

Members of the Air Force Old Guard Carry team carry the transfer case of Seaman Apprentice Cameron S. Walters at Dover Air Force Base on Sunday

Al-shamrani was on the base as part of a U.S. Navy training program designed to foster links with foreign allies.

He had started training in the United States in 2017 and had been in the Pensacola area for the past 18 months, authorities said.

Family members and others identified the three dead as Joshua Kaleb Watson, a 23-year-old graduate of the US Naval Academy; Airman Mohammed Sameh Haitham, 19, of St. Petersburg, Florida, who joined the Navy after graduating from high school last year; and Airman Apprentice Cameron Scott Walters, 21, of Richmond Hill, Georgia.