In a Sunday statement, Mousavi also expressed sympathy with the American people, particularly the families of the victims of the heinous crimes, and wished speedy recovery for tens of people wounded in these tragic incidents.
A total of 20 people were killed in the majority Latino city, nestled in western Texas on the US-Mexico border, as federal authorities investigated a potential hate crime and local prosecutors charged a 21-year-old white man, Patrick Crusius, with murder and said they would pursue the death penalty.
The suspect was from the town of Allen 650 miles from the site of the shooting, at a busy Walmart in the city.
Less than 13 hours later another mass shooting took place in the city of Dayton, Ohio, leaving nine dead there and bringing the total injured from both shootings to at least 52.
Authorities in Dayton named the shooter as 24 year-old Connor Betts and listed the names of the nine people killed, which included the shooter’s sister 22-year-old Megan Betts.
Police in El Paso were examining a hate-riddled message on the website 8chan, posted around 20 minutes before Saturday’s attack, in which the author expressed sympathy for a white nationalist massacre at mosques in Christchurch, New Zealand, a few months ago, and which stated: “This attack is a response to the Hispanic invasion of Texas.”