CIUDAD VICTORIA, Mexico: Mexico’s president vowed to investigate the border shootings that left 19 dead over the weekend, even as the latest homicide figures showed a rebound in killings nationwide.

President Andrés Manuel Lopez Obrador said evidence indicated that 15 of the victims were innocent bystanders. The other four dead were suspected gunmen from a group that drove into the northern border city of Reynosa and opened fire indiscriminately.