China launched the Chuangxin-3 and Shiyan-7 satellites along with Shijian-15 aboard a Long March rocket from Jiuquan, expanding its growing satellite constellation.

Two pressure-cooker bombs exploded near the Boston Marathon finish line, killing three spectators and injuring more than 260 others.

Police captured a wounded Dzhokhar Tsarnaev hiding in a backyard boat, ending a citywide lockdown four days after the Boston Marathon bombing.

Croatia became the 28th member state of the European Union, two decades after fighting a brutal war of independence from Yugoslavia.

NASA launched the MAVEN spacecraft from Cape Canaveral to study how Mars lost its atmosphere and much of the water once believed to have covered its surface.