At least two people were killed and eight more critically injured in a shooting Saturday afternoon at Brown University in Rhode Island, authorities said. The suspect is still believed to be at large. 

In a news conference Saturday evening, Rhode Island Mayor Brett Smiley said that the shooting was reported in the Barus & Holley engineering building a little after 4 p.m. local time. 

Smiley said that at least two people were killed and eight more taken to Rhode Island Hospital in "critical but stable" condition.  

"Those are the only injuries or casualties that we know at this time," Smiley said, adding that "these numbers may change, we are still in early hours."

The school said that final exams were taking place in the building at the time of the shooting.   

Smiley said that no arrests had been made, and a shelter-in-place was in effect for the Brown University area. 

"If you live on or near Brown's campus, we are urging you to stay home and stay inside," Smiley said. 

A university alert told students to lock doors, silence phones and stay hidden until further notice. A senior law enforcement source had told CBS News that preliminary information indicated that at least two victims were dead and about 20 others were injured.

Those who were injured might not all have sustained gunshot wounds, the source said.  

Just before 6 p.m. local time, Brown University Public Safety said that the "situation remains ongoing."

In a follow-up alert, the school said that shots had also been fired near Governor Street, a few blocks away. However, it later said that the report of a "secondary shooting incident" was "unfounded."

President Trump wrote in a Truth Social post that he had been briefed on the shooting. 

"God bless the victims and the families of the victims!" Mr. Trump said. The president initially wrote that a suspect was in custody, but in a follow-up social media post, wrote, "The Brown University Police reversed their previous statement — The suspect is NOT in custody."

The FBI confirmed in a statement to CBS News that it was assisting "our law enforcement partners in Rhode Island with any and all available resources." 

The Bureau of Alcohol, Tobacco, Firearms and Explosives also posted on X that it was sending agents to the school. 

Rhode Island Gov. Dan McKee advised in a social media to "stay clear of the area and monitor official channels for updates." 

"Praying for our community," the governor said. 

This is a breaking news story. Check back for updates