Washington/Houston: Two separate mass shootings within 24 hours left 30 people dead and several others injured in the US states of Texas and Ohio, including one thought to be a hate crime.

The first shooting took place in the southern border town of El Paso in Texas, where a 21-year-old gunman opened fire at a crowded Walmart store, killing 20 people and wounding 26 others on Saturday. Hours later, a man killed nine people before being shot dead by police in Oregon district, a historic neighbourhood in Dayton, Ohio early Sunday, police said.