By MATT SEDENSKY and ASTRID GALVAN
Associated Press

EL PASO, Texas (AP) - Authorities in two U.S. cities scoured leads in a pair of weekend mass shootings that killed 31, trying to piece together the motives that led two young men to unleash violence on innocent people in crowded public places. In El Paso, Texas, the death toll creeped upward Monday from the shooting two days earlier at a Walmart store, with two additional victims succumbing to injuries. In Dayton, Ohio, even more questions remained about what spurred the suspected shooter.

The back-to-back shootings hours apart and 1,300 miles (2,092 kilometers) away from each other quickly turned political, with Washington lining up along typical party contours in response. President Donald Trump cited mental illness and video games but steered away from talk of curbing sales of guns, including the military-style weapons believed to have been used in the attacks.

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