At least four people were killed and 15 others injured in multiple shootings across the United States over Halloween weekend.Police in Dallas said they were investigating multiple reports of shootings in the Deep Ellum neighbourhood on Saturday night.Police Chief Daniel Comeaux said they are trying to determine if the shootings in the Deep Ellum neighborhood were related, the Associated Press reported.The shootings were among several violent incidents reported across the country over the Halloween weekend.One killed, eight injured near Alabama stadiumSeparately, one person was killed and eight others were wounded in a shooting near Legion Field in Birmingham, Alabama, on Saturday night, shortly after the annual Magic City Classic football game.Birmingham Police Department chief Michael Pickett said most spectators and families had left the stadium when the shooting took place nearby, along Graymont Avenue, where vendors had set up stalls.The circumstances leading to the shooting were not immediately clear.Police spokesperson De’Rell Freeman said one person had been detained and taken to police headquarters for questioning. Officers had also recovered and secured “multiple weapons”, he said.The Magic City Classic is an annual football rivalry between Alabama State University and Alabama A&M University, two historically Black institutions whose teams have competed for more than 100 years.Nearly 70,000 fans attended Saturday’s game, which Alabama A&M won 31-28. The event draws some of the largest crowds for college football games in the teams’ division.Six shot near University of DelawareIn Newark, Delaware, six people were shot near the University of Delaware campus shortly after 11.10pm on Saturday, police lieutenant Greg D’Elia said. All six were taken to hospitals for treatment.Videos shared on social media showed people running away from the scene. A stretch of the city’s Main Street was closed for several hours after the shooting.Six injured in Arkansas shootingIn Fayetteville, Arkansas, six people were taken to hospitals with gunshot wounds after a shooting early on Sunday.No arrests had been made, police said in a news release. A preliminary investigation indicated that an altercation had taken place before the shooting, they added.