No arrests day after chaotic shooting attack in Baltimore

Baltimore police forensics officers place evidence markers next to bullet casings while investigating the scene of a shooting in Baltimore on Sunday, April 28, 2019. A gunman fired indiscriminately into a crowd that had gathered for Sunday afternoon cookouts along a west Baltimore street, killing one person and wounding seven others, authorities said. (Kenneth K. Lam/The Baltimore Sun via AP)

Police work near the scene where authorities say several people were shot, at least one fatally, Sunday, April 28, 2019, in Baltimore. (AP Photo/Steve Ruark)

BALTIMORE — Baltimore police detectives are trying to figure out whether a chaotic shooting attack on a crowd enjoying a weekend cookout might be competition between underworld groups, a triggerman seeking vengeance or another kind of senseless strike.