Four people are killed and about 15 are hurt in three Halloween night shootings in Dallas' Deep Ellum district

Four people were killed and about 15 others were injured in three shootings in Dallas' Deep Ellum entertainment district early Sunday, as crowds filled the neighborhood on Halloween night, police said, according to The Dallas Morning News.

The first shooting happened about 12:20 a.m. in the 2600 block of Elm Street, followed by one at about 1:05 a.m. in the 2600 block of Main Street and a third at about 1:35 a.m. in the 200 block of South Crowdus Street, according to a preliminary police account. Police Chief Daniel Comeaux said investigators had no information that the three shootings were related but were still working to determine whether they were, NBC 5 Dallas-Fort Worth reported.

Comeaux said the injury count could change because several people took themselves to hospitals. He said the department had added officers in Deep Ellum because Halloween fell on a Saturday, and that officers nearby ran toward the gunfire and revived at least one victim. No officers were hurt.

The Dallas County Medical Examiner's Office identified two of the people killed as Kaniesa Scott, 21, and Unique Elise Benjamin, 28, NBC 5 reported. Family members identified two other victims as Anthony Martin, 25, and Isaiah Boling, 20, a father of two, CBS News Texas reported.

On Monday, Dallas police and federal agencies announced an effort called Operation Deep Cover aimed at violence in the neighborhood. In its first case, police arrested a man on a charge of being a felon in possession of a firearm. Police said he was not responsible for any of the weekend shootings. Investigators asked anyone with video or photos from the area to share them with police.