A cyclist was killed in a collision with a tractor-trailer Thursday morning, shutting down a portion of Commonwealth Avenue as police investigated the incident.

According to Boston Police, at 8:36 a.m., a male bicyclist in his twenties made contact with an 18-wheeler at the intersection of St. Paul Street and Commonwealth Avenue, near Boston University campus. Police closed down the 900 block where the accident occurred.

The cyclist was pronounced dead at the scene of the crash.

A spokesman from the Suffolk District Attorney’s Office said by statute, the DA’s office has jurisdiction over all death investigations and they always send a prosecutor to the scene of a fatality, however, no citations or charges have been issued against the driver of the tractor-trailer at this time.

People reported seeing a sheet over the bike and the victim at the scene as they passed the accident near Boston University’s campus.

The investigation brought traffic to a stand still and caused delays on the MBTA’s Green Line B-branch.

The accident comes just hours before Boston City Councilors are scheduled to meet and talk about increasing safety for riders in the city.

This is the fifth fatality since the summer and the second incident near Boston University in just a month.

In November, an MBTA bus hit BU student Chung-Wei Yang while he was riding his bicycle in Allston near the intersection of Harvard and Brighton Avenues. Yang was pronounced dead at the hospital.

At the time of Yang’s death, Boston Police said a preliminary investigation “[suggested] an MBTA bus did come in contact with the victim.” However, officers said there was no indication that the driver or any of the passengers on the bus knew anyone was struck.