On Saturday, a gunman opened fire in a Walmart in El Paso, Texas, killing 22 people and injuring dozens of others before being arrested. The incident is being investigated as an act of domestic terror.

Less than 24 hours later, a man in Dayton, Ohio killed nine people, including his own sister, and wounded 27 others before he was killed by police.

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“Nearly every mass shooting illustrates that large-capacity magazines can increase the death toll and that forcing a shooter to reload more frequently can provide opportunities for counter-attack by those around,” John Donohue, who researches mass shootings at Stanford University, previously told Business Insider.

He added: “Accordingly, a ban on high-capacity magazines is absolutely essential if one wants to reduce the loss of life from active-shooter scenarios.”