The tragic killing at the Washington Navy Yard that left at least 12 people dead have prompted a worldwide outpouring of sympathy from celebrities on Twitter.

President of the United States, Barack Obama and celebrities took to Twitter to react to the incident.

"@BarackObama "We send our thoughts and prayers to all at the Navy Yard who've been touched by this tragedy." —President Obama"

"@Pitbull crazy what happened in DC this morning #NavyYardShooting our hearts and prayers go out to the families of the victims"

"@latoyajackson Deeply sadden to hear the disappointing news on the #NavyYardShooting in Washington. Strength & Prayers to those effected by such tragedy."

"@ladyantebellum thinking about everyone at the Navy Yard in DC affected by this shooting. hopefully this will get resolved soon. ck"

"@DrOz My thoughts and prayers go out to all those affected by the tragedy at the Washington Navy Yard #NavyYardShooting"

"@leannrimes The news of the navy yard shootings is horrific. Prayers go out to everyone involved & touched by this tragedy. So sad!"

"@MelissaJoanHart Prayers going out to the Washington Navy Yard today! Unbelievable how often these shootings are happening!!"

"@ricky_martin Another mass shooting. So sad. My heart goes out to the families and loved ones of the victims of the #NavyYardShooting."

"@ramonasinger Thoughts and prayers are with DC. When will this all stop? So sad #NavyYardShooting"

"@kenjeong My thoughts and prayers go out to all those affected by the tragedy at Washington Navy Yard."

"@AshleyRickards My thoughts and prayers go out those who were affected in the #NavyYardShooting today..."