Source: Reuters

Two mass shootings in El Paso, Texas and Dayton, Ohio, on August 4 left dozens of civilians dead and injured.

In Texas, 27 people were wounded, and another 26 were hurt in Ohio, where the shooter was killed in roughly 30 seconds by police who were patrolling nearby.

Dayton Police Chief Richard Biehl told a news conference Sunday that the shooter - a 24-year-old white man called Connor Betts - wore a mask and a bullet-proof vest and was armed with an assault rifle fitted with a 100-round drum magazine.

His sister, who had gone with him to the scene, was among those killed.

Police said on Monday they had no evidence so far that race played a part in the Dayton shooting.

In Texas, police said the suspect surrendered on a sidewalk near the scene of the massacre. He was described in media reports as a 21-year-old white man named Patrick Crusius.

He was believed to have posted online a manifesto denouncing a "Hispanic invasion" of Texas. El Paso, on the border with Mexico, is majority Latino.