The workplace killings in Orlando mark the 144th mass shooting this year

There have been 155 days in 2017 – and 144 mass shootings reported.

Five people were killed in a workplace shooting near Orlando, Florida, before the former employee turned the gun on himself.

The shooting happened around 8 a.m. (EST) Monday at Fiamma, a company that makes awnings for vehicles, the Orange County Sheriff's Office says. Four people – three men and one woman – died at the scene, while another man died at the hospital, the sheriff's office tweeted. Seven people survived.

The 45-year-old "disgruntled former employee" had been fired from the company earlier this year, officials said.

"Over the past year, the Orlando community has been challenged like never before. ... I ask all Floridians to pray for the families impacted by this senseless act of violence," Florida Gov. Rick Scott said in a statement.

It happened nearly a year after the worst mass shooting in modern U.S. history

Monday's mass shooting happened nearly one year after the attack at Pulse nightclub, in which 49 people were killed and 53 were injured.

That attack was the worst mass shooting in modern U.S. history.

So far this year there have been 144 mass shootings (an incident where four or more victims are shot, not including the shooter), according to the Gun Violence Archive.

That includes two in Minnesota in 2017: On April 7, a father and his two daughters were killed in St. Paul, while their mother was injured. And on Jan. 30, four people were shot at a Holiday gas station in Crystal.

Shootings at the workplace

Violence at work is one of the leading causes of job-related deaths, according to OSHA.

In 2015, there were 417 workplace homicides in the U.S. – 354 of those killed had been shot, the Bureau of Labor Statistics said.

Information for how many of those shootings involved multiple victims isn't available for that year, so let's look at the most recent data available: In 2010 there were 518 workplace homicides reported. In 77 of them, two or more workers were killed, the Bureau of Labor Statistics reported.

Between 1982 and 2017, there were at least 22 mass shootings at workplaces in the U.S., according to a Statista report. The most deadly one was the United States Postal Service shooting in Edmonton, Oklahoma, in 1986 – 15 people died (including the disgruntled employee) and six were injured.

The deadliest workplace shooting in Minnesota happened in 2012. An employee killed four people and then himself at Accent Signage. Two other victims died later.

In a report a few years ago, the FBI said incidents of mass murder at work are "relatively infrequent events" and represent "a very small number of workplace violence incidents."

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