More than 4 million students participated in lockdowns over 2017-18 school year: report

More than 4 million school students in the United States participated in lockdowns during the 2017-2018 school year, according to a new Washington Post analysis on school safety

According to the analysis, 4.1 million students had to participate in at least one school lockdown during the school year, and on average 16 campuses per day across the U.S. were placed on lockdown. There was not a single day between Labor Day of 2017 and Memorial Day 2018 without a lockdown, according to The Post.

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Of those lockdowns, 15 percent were reportedly due to bomb threats, while 61 percent were related to firearms. 

The Post notes that the number of students who participated in lockdowns is larger than the combined populations of Maine, Rhode Island, Delaware and Vermont. As the first study of its kind, there is currently no comparable data on lockdown frequency from past school years.

The study comes at the end of a year dominated by debate over gun control laws and school safety, after February's school shooting in Parkland, Fla., refocused the nation's attention to the issue.

House Minority Leader Nancy Pelosi (D-Calif.), who is expected to return as Speaker in the next Congress, has promised that gun control will be a priority under the newly elected Democratic majority. Democratic lawmakers have floated legislation ranging from universal background checks to an assault weapons ban in the wake of recent shootings. 

The Trump administration also announced this month that it would formally ban bump stocks, devices that allow semi-automatic weapons to fire much more rapidly. 

Police said a bump stock was used when almost 60 people were killed and more than 500 were wounded in a mass shooting at a country music festival in Las Vegas in October 2017.