At least two people have been killed and eight others critically injured in a shooting on the campus of Brown University in Rhode Island, officials have said.

The incident is believed to be unfolding near an engineering building on the campus, according to the school's alert system.

Providence Police and the Rhode Island State Police are responding.

It is unclear at the moment whether arrests have been made.

Brown University says no suspects are in custody and that additional shots may have been fired.

US President Donald Trump corrected an earlier post he shared online, clarifying that a suspect was not in custody. In his previous post, he had stated that a suspect was in custody.

University officials initially told students and staff that a suspect was in custody, but later said this was not the case and police were still searching for a suspect or suspects.

Officials noted that the information remained preliminary as investigators try to determine what has occurred.

Police are actively investigating and still gathering information from the scene, said Kristy DosReis, the chief public information officer for the city of Providence.

The shooting was reported near the Barus & Holley building, a seven-storey structure that houses the School of Engineering and Physics Department, according to the school's website.

It includes 117 laboratories, 150 offices and 15 classrooms.

Brown is a private university with roughly 7,300 undergraduate students and more than 3,000 graduate students.

Providence Council member John Goncalves, whose ward includes the Brown campus, said:"We're still getting information about what's going on, but we're just telling people to lock their doors and to stay vigilant.

"As a Brown alum, someone who loves the Brown community and represents this area, I'm heartbroken. My heart goes out to all the family members and the folks who've been impacted."

Please refresh the page for the latest version.