In Washington state, authorities kept a gun out of the hands of a man bent on setting a record death toll for mass shootings.
A Florida judge in the county where 17 people were killed in a high school shooting last year has since handled more than 330 petitions to take guns from people thought to be a threat to themselves or others.
And California added new ammunition limits to what are already some of the nation's strictest gun laws.
Across the country, a growing list of states require new measures like universal background checks and "red flag" laws to curb gun violence before it starts. The changes are part of a national movement for tougher gun laws now stirring in Minnesota in response to an ongoing cycle of bloodshed.
"Every time there's a shooting, these [proposals] come to the forefront again," said Chief Circuit Judge Jack Tuter, who has presided over all of the Broward County petitions for "extreme risk protection orders" since last year's shooting at Marjory Stoneman Douglas High School in Parkland prompted Florida to pass a red flag law.
"When we enacted ours, there were only five states that had them. And when I looked at the map the other day — man, states have gone crazy. It looks like everybody is doing them."
Nearly all of the 17 states — plus the District of Columbia — that adopted red flag laws did so after the Parkland shooting, which fueled a youth-driven movement for stronger gun control. Twenty-one states and D.C. also now require background checks for all gun transfers, including private sales. Back-to-back shootings that killed more than 30 people in El Paso, Texas, and Dayton, Ohio, this month have intensified calls for new restrictions nationwide, including in Minnesota, although partisan divisions have so far stalled any new gun laws.
Gun-rights activists also are mobilizing. Even in states where new gun laws have passed, some law enforcement leaders are establishing "Second Amendment sanctuaries" where they say they will refuse to enforce them. And Colorado state Rep. Tom Sullivan, a Democrat whose son was killed in the 2012 Aurora movie theater shooting, faced an unsuccessful recall attempt after sponsoring a red flag bill.