One of the deadliest mass shootings in American history took place on Sunday night in Las Vegas, when 64-year-old Stephen Paddock shot at a crowd of 22,000 people attending a country music festival.

Since the incident, where at least 59 people were killed and more than 520 injured, businesses around the country have offered their support to victims and their families. "Las Vegas is our home," Zappos wrote on its website. The online shoe and clothing shop also promised to match donations made to CrowdRise by up to $1 million.

Other startups have also pledged their support to those impacted by the shooting. Uber is offering free rides to and from nearby hospitals and the family reunification center, the company announced on Monday. Lyft said it's giving free rides up to $40 in the same transportation zones.

The UFC, which has strong ties to Las Vegas, will donate $1 million to victims and families, a company spokesperson said. The company also announced that its UFC 216, a mixed-martial-arts event scheduled to take place Saturday, will continue as planned and will be dedicated to the city.

A number of people also flocked to blood banks and hospitals to give blood, while others donated to a GoFundMe page set up for victims. As of Tuesday morning, it was less than $500,000 short of its $3.5 million goal.