FLINT, MI -- A police officer stabbed this morning at Bishop Airport has improved to stable condition following the attack and a suspect is in custody.

Michigan State Police confirmed the condition of the on-duty officer and identified him as Jeff Neville, who was initially reported in critical condition after the assault.

Jeff Neville

MSP said in a Twitter post that the FBI is leading an investigation, and an FBI spokesman said officials were planning a news conference later today.

Although there have been reports that the attack was being investigated as an act of terrorism, the FBI called that speculation premature.

At least one report identified the attacker as Canadian, and the government of Canada issued a statement saying it was aware of the attack.

"Canada condemns this heinous and cowardly act," the statement says. "Our thoughts and sympathies are with the officer and his loved ones." "Our government and law enforcement agencies are engaged and are cooperating fully with our American counterparts and assisting them in every way possible."

Bishop announced on its Facebook page that the airport, which has been turned into a massive crime scene, is closed until further notice

Every entrance to the airfield was blocked by police from Flint and surrounding areas, and a Salvation Army truck was set up as a command center.

Police ran dogs throughout the parking lot in the aftermath of the incident.

Flint Airport Press Conference FBI and police officials share information about police officer at Flint's Bishop International Airport: Posted by MLive.com on Wednesday, June 21, 2017

A witness told MLive he saw a man near a knife on the floor of the airport terminal and saw an officer on his knees and bleeding from the neck while at the airport this morning.

"The cop was on his hands and knees bleeding from his neck," said Ken Brown, who was dropping his daughter off at the airport. "I said they need to get him a towel."

Bishop's Facebook page says no passengers have been injured.

In response to the stabbing, Flint police were stationed around the City Hall but the building remained open for business.

The Associated Press reported President Donald Trump has been briefed on the stabbing.

White House press secretary Sean Spicer told the AP that Homeland Security Adviser Tom Bossert briefed Trump on Wednesday regarding the stabbing, which resulted in the second evacuation at Bishop this month.

The airport terminal was also evacuated June 8 after officers noticed a suspicious bag.

Police said at the time that there was nothing dangerous in the bag after taking the precaution.

Genesee County Commissioner Mark Young, a close friend of Neville, called him "an honorable man" whom he worked with at the Genesee County Sheriff's Office.

Neville was a lieutenant with the airport's police department, said Young, who met with the victim's family at the hospital today.

"As expected, they are shook up. They are concerned," he said.

In a Twitter message, Gov. Rick Snyder asked state resident to "keep the attacked officer in your thoughts and prayers."