Detectives were looking for four people who may have been involved in the drowning death of a beloved boat captain during a violent Labor Day weekend that garnered the attention of President Donald Trump.

An internal police alert displayed photographs of two women and two men who police were seeking to identify in the homicide investigation being conducted by Area 3 detectives.

According to a source, Nabil Abzal was apparently injured — possibly by one of the four pictured in the alert — prior to falling into the water.

One of them allegedly pushed Abzal, who fell and hit his head and then fell into the water, the source told the Sun-Times.

Abzal, fondly known in the boating community as “Captain Bill,” was pulled from the DuSable Harbor around 3 a.m. Saturday and pronounced dead at th

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