Gun violence plagued the Halloween weekend across the U.S., with shootings leaving over a dozen people dead and 90 people injured.

Three shootings in Dallas, Texas, killed four people and left 15 injured early Nov. 1 within a span of about 75 minutes. Authorities are still investigating the shootings, but police say there was no indication the three incidents were connected. One person is in custody, and Dallas Police said they are reviewing surveillance footage.

One person was killed and eight were injured in two separate shootings Oct. 31 after the "Magic City Classic" college football game between Alabama State and Alabama A&M in Birmingham, Alabama. Police said one person was detained and taken for questioning at police headquarters, and multiple weapons were found and secured at the scene.

A mass shooting at a Spirit Halloween costume store in Fairfield, California, killed a pregnant woman and injured six others. Two separate shootings in Delaware killed one person and injured 14.

Seven other states experienced deadly shootings as people celebrated Halloween.

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