A man struck a MBTA bus and then a light pole in South Boston after suffering an apparent heart attack while driving Thursday evening, police said.

Officers on scene at the intersection of East Broadway and L Street saw the driver cross East Broadway through a red light while leaning on his steering wheel just after 5 p.m., police spokeswoman Officer Nicole Grant said. The vehicle struck a MBTA bus traveling east on East Broadway in the rear passenger side corner before striking the light pole, police said.

The officers found the 60-year-old victim “slumped over” the steering wheel, Grant said. She did not know if the driver was conscious when the officers approached him.

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Officers originally reported the incident as a cardiac arrest, police said.

The driver was transported to Boston Medical Center, police said. His condition was not known Thursday night.

No one else was injured in the accident, Grant said.

It is not clear whether any trick-or-treaters were endangered by the crash.