One man was fatally shot and three other people were wounded in the District late Saturday afternoon near the campus of Howard University and the route of the Caribbean Carnival parade.

The shooting occurred a few minutes after 5 p.m. near Gresham Place and Georgia Avenue NW. Georgia is the thoroughfare along which thousands of people had watched or taken part in the parade.

It appeared that the parade had largely passed when the gunfire erupted, but many people had remained near the route. Witnesses said the sound sent people fleeing down Gresham Place and away from Georgia.

Assistant D.C. Police Chief Diane Groomes said the shooting had no connection to the festival or the university. Investigators think it stemmed from a neighborhood issue, she said.

Three of the four shooting victims were from outside the neighborhood, police officials said.

Police said about 20 shell casings from at least two guns were found. They said the shooting apparently broke out near an alleyway between rowhouses and a commercial building.

“It is unbelievable that this could happen,” said D.C. Council member Jim Graham (D-Ward 1). “There were police everywhere.” Graham said he had been in the parade.

Mayor Vincent C. Gray (D) also went to the shooting scene Saturday evening.

In addition to the man who was killed, two males and one female were wounded, authorities said.

Police said a gun was found near Gresham Place, a one-block street that runs between Georgia and Sherman avenues, near the northwestern edge of the Howard campus. One victim was found nearby, police said.

Meanwhile, in a separate and apparently unrelated incident, a stabbing occurred several blocks south at Georgia and W Street, police said. Groomes said an arrest had been made in the stabbing.

Staff writer Martin Weil contributed to this report.