State trooper Campus police officer shot, killed on MIT campus; shooter on the loose [pics]; Updated

#Breaking : Mass State Police confirm #MIT officer wounded in shooting has died.

— NBC Connecticut (@NBCConnecticut) April 19, 2013

Bombings at the Boston Marathon, fertilizer plant explosion in Texas, and now a shooting at MIT. What is going on in the world?

— Life As Bros (@LifeAsBros) April 19, 2013

boston marathon bombing, ricin poisoning attempt on the president, explosion in waco, and now mit shooting. damn. what a crazy week.

— javiercito (@javierPsalazar) April 19, 2013

MIT shooter was described as Hispanic male in a cowboy hat, likely with blood on him.

— Adam Gaffin (@universalhub) April 19, 2013

Police, DA Investigating Fatal Shooting of Campus Police Officer In Cambridge. #CambMA #MIT

— Cambridge Police (@CambridgePolice) April 19, 2013

Shooting incident continues to be investigated. Stay vigilant, stay indoors and away from Building 32/76 (Stata/Koch) http://t.co/L0KetBBsjr

— MIT (@MIT) April 19, 2013

Police are sweeping the campus in relation to the shooting at Building 32/76 (Stata/Koch), continue to stay indoors until further notice.

— MIT (@MIT) April 19, 2013

So my boyfriend @elminster55 is at #MIT right now, in the building that the shooter was reported being at. #stress #soconcerned #MITshooting

— Kitty (@kalliburr) April 19, 2013

Media being moved back a block… Mass State Police not telling us of shooter still on loose #MIT pic.twitter.com/67K3XF8Nz4

— George Colli (@GeorgeColli) April 19, 2013

Main St now closed down in Kendall Square Cambridge. MIT police officer killed, search for shooting suspect pic.twitter.com/hCPFjM5hBO

— Josh Brogadir (@JoshBrogadirTV) April 19, 2013

There is an extensive search taking place on the MBTA Red Line for this MIT/Cambridge shooting suspect.

— Marc Bertrand (@Marc_Bertrand) April 19, 2013

MIT Police have determined that the suspect in this evening’s shooting is no longer on campus. It is now safe to resume normal activities.

— MIT (@MIT) April 19, 2013

Though it is now safe to resume normal activities, please remain vigilant in the coming hours.

— MIT (@MIT) April 19, 2013

A hero: RT @jvansack Officials identify murdered MIT Police officer as Sean Collier, 26, of Somerville. Just awful.

— Tommy Duggan (@ValleyPatriot) April 19, 2013

Deepest condolences to the family of Sean #Collier, the police officer killed at MIT last night. He was 26

— West Wing Reports (@WestWingReport) April 19, 2013

RIP RT @BostonGlobe MIT police officer killed confrontation w terror suspects was Sean Collier, 26, of Somerville, per Middlesex DA. #tcot

— slone (@slone) April 19, 2013

MIT release on slain officer Sean Collier, 26, killed in line of duty. RIP http://t.co/dcwlogokc3

— Major Garrett (@MajorCBS) April 19, 2013

Ugh. Not enough ways to thank first responders MT @cambridgechron: Sean Collier, 26, victim in last night’s shooting pic.twitter.com/JjuW9RZEUU

— pourmecoffee (@pourmecoffee) April 19, 2013