Police in Texas said around 20 people were shot in the Midland and Odessa area on Saturday by at least one and possibly two shooters in separate vehicles, a local television station reported.
The massacre by at least one gunman during Friday prayers in the city of Christchurch is the country's worst ever mass shooting and was condemned throughout Asia.
The timing of the shootings in the city of Christchurch, during Friday prayers, and the posting on social media of what appeared to be live, point-of-view video footage of the assault by a gunman added to the distress of many.
"I can confirm that the individual who was taken into custody I have been advised is an Australian-born citizen," Australian Prime Minister Scott Morrison said.
A woman opened fire at YouTube's headquarters near San Francisco, sending employees scrambling into the street and at least three victims to local hospitals