BRIDGEPORT — A city man in his 50s was killed Tuesday afternoon when he was struck by a dump truck while riding a bicycle in the city’s South End. The man, who was not immediately identified, died at the scene from multiple injuries. Police said no one had been arrested in connection with the crash and it was still under investigation. According to police, shortly after 1 pm, the man was riding his bicycle southbound on Iranistan Avenue when he was struck by the dump truck as it turned onto Iranistan from Admiral Street. "I heard this loud thump and I looked out and saw all these parts lying in the street," said Jose Quesada, who was working at the nearby car wash on Iranistan Avenue. "It was terrible." The crash left a trail of debris from Admiral Street to South Avenue. First there was a black sneaker, then a twisted bike part, then another black sneaker, the mangled blue bicycle and finally the victim's body covered in a white sheet. Dozens of people came out of their homes in the area to brave the sweltering temperature and get a look at the crash scene. One woman, who said she was the victim's wife, loudly sobbed by the side of the street until she was led away by police officers.