Law enforcement will beef up its presence in a Dallas entertainment district where several deadly shootings occurred over the weekend, federal authorities announced Monday as they joined elected officials nationwide in decrying gun violence in popular public places.

Across the country, numerous mass shootings on Halloween weekend left at least 10 people dead and dozens more injured.

In Dallas, three shootings in Deep Ellum, a neighborhood of music and restaurants, left four people dead and 15 injured over the span of an hour and 15 minutes early Sunday.