Nine U.S. senators sent letters to Google, eBay and Amazon imploring the e-commerce giants to end "loopholes" on their sites that "reportedly allowed listings for the purchase of shotgun rounds, ammunition clips, and assault weapon components."
The lawmakers, led by Sen. Robert Menendez, asked the companies' CEOs for oversight details, such as how the companies police their online marketplaces.
The senators wrote: "We write to urge you to immediately implement stronger measures to keep gun accessory sales off your platform. America is in the throes of a gun violence epidemic and it is incumbent upon corporate America to do its part to help end the carnage."
They sent the letters in the wake of a series of mass shootings that have occurred over the last month, taking the lives of dozens and injuring many others.
The letters' signees included multiple Democratic presidential hopefuls, including Sens. Cory Booker, Kamala Harris and Amy Klobuchar.