US senators unveiled a bill Tuesday addressing the epidemic of gun violence plaguing the country as they locked down a narrow set of reforms nevertheless hailed as the first significant federal firearms controls in a generation.

WASHINGTON (AP) — The country has long endured a numbing succession of mass shootings at schools, places of worship and public gathering places. None forced Congress to react with significant legislation — until now.

Last month, a white shooter was accused of racist motives in the killings of 10 Black people in a supermarket in Buffalo, New York. Another gunman killed 19 students and two teachers at an elementary school in Uvalde, Texas.

The slayings of shoppers and school children just 10 days apart — innocents engaged in every day activities — helped prompt a visceral public demand for Congress to do something, lawmakers of both parties say. Bargainers produced a bipartisan gun violence bill that the Senate is moving toward approving later this week, with House action expected sometime afterward.

Here's a look at the confluence of factors that helped to produce a compromise.

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Associated Press writer Susan Haigh in Hartford, Connecticut, contributed to this report.