LAS VEGAS, NV - SEPTEMBER 18:  Singer Christina Grimmie attends the 2015 iHeartRadio Music Festival at MGM Grand Garden Arena
Isaac Brekken/Getty Images for iHeartMedia

Christina Grimmie, who launched a pop music career after participating on The Voice, was shot and killed last night after a concert in Orlando. Tributes from all over the world have poured out on social media for 22-year-old, especially on Twitter, where the #RIPChristina hashtag has accrued nearly 2 million tweets—making it the top worldwide trend on Saturday.

Here are a few of the most poignant tweets posted in the wake of Grimmie's passing. 

Grimmie was shot after a performance in Orlando Friday night by a still unidentified assailant. NPR reports that Grimmie's brother immediately tackled the suspect after the shooting. Orlando police credit Grimmie's brother with "stopping him [the shooter] from causing any more harm to Christina and her fans." USA Today reports that the suspect was a 21-year-old white male armed with two guns and a hunting knife. He had traveled from another city in Florida specifically to attack Grimmie. The shooter killed himself shortly after the incident, and was pronounced dead on the scene.