Thousands of people and law enforcement officers are attending today’s memorial service to honor MIT Officer Sean Collier. 

The 26-year-old was fatally shot late Thursday allegedly by Marathon bombing suspects Tamerlan and Dzhokhar Tsarnaev.

Musician James Taylor will perform during today’s service and Vice President Joe Biden will speak.

A live webcast of the service can be viewed here.

Collier’s funeral was private and was held Tuesday.

Follow Michael Naughton on Twitter @metrobosmike.

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Officials at Mt. Auburn Hospital in Cambridge gave an update today on the condition of MBTA Transit Police Officer Richard Donohue, 33, who was severely wounded early Friday during a Watertown shootout with the Boston Marathon bombing suspects.

Donohue, a Woburn resident, sustained a gunshot wound to his right thigh and suffered major blood loss, according to Mt. Auburn Critical Care Doctor David Miller, who also said CPR was started in the field by first responders and he required a prolonged resuscitation – 45 minutes – that took place on the scene and at the emergency room. Miller said nearly his entire blood volume was lost. When he was stabilized, a surgical team stopped the bleeding.

Today he opened his eyes, squeezed his wife’s hand on command, and wiggled his toes, however he is on a mechanical ventilator, and continues to need a high level of sedation. Doctors described his condition as stable but still in critical condition.

Transit Police officer Richard Donohue poses with fallen MIT Campus Police Officer Sean Collier, 26, who was shot and killed by the Boston Marathon bombing suspects Thursday night.

“It’s early to say what his status is going to be like over next few days, but we remain cautiously optimistic,” Miller said.

Doctors said they expect Donohue will be able to walk again.

Donohue, who has been a Transit Police officer for three years, was one of two officers to be shot at during a 24-hour manhunt. MIT Campus Police Officer Sean Collier, 26, was shot and killed in his cruiser. Transit Police Officer Paul MacMillan said today that Donohue took shots at the suspects, Tamerlan Tsarnaev, 26, and Dzhokhar Tsarnaev, 19. Tamerlan was killed due to gunfire.

“He did fire his weapon…  He engaged the terrorist,” MacMillan said.

His younger brother Ed Donohue, also a police officer, said that as officers they have a duty to help people. “He’s a great cop. He loves being a cop…. We couldn’t be more proud. I’m sure that in his heart he did the right thing. He went in there and engaged people that were shooting his fellow officers.”

Despite the circumstances, Donohue seemed to be keeping spirits up.

“I’m the better looking one, obviously. He may be a little bit smarter,” Donohue said, drawing laughter from media, hospital and MBTA staff. “He’s devoted to his baby,” he said of his brother’s 6-month-old son, Richie.

“We joke back in forth… I always used to tell him, ‘You’re not going to see any action because you’re on the subway. But there he is, jumping into the midst of a gunfight in Watertown and making our family very proud and our entire state and country very proud.”

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UPDATE: Police searched a building at the Massachusetts Institute of Technology on Saturday before concluding that a report that a gunman was on campus wearing body armor was “unfounded.”

MIT had issued a “shelter in place” warning on Saturday and said that multiple law enforcement agencies, including Cambridge Police, had responded to the report.

The Cambridge Police Department said on its website that it had searched the building with “negative results” and then concluded there was no threat to public safety.

“Scene is clear. Call unfounded,” the department said.

PREVIOUSLY: The Massachusetts Institute of Technology on Saturday issued a “shelter in place” lockdown warning after police said they had received a report there could be a person in a campus building with a long rifle and wearing body armor.

The notice on MIT’s website said that multiple law enforcement agencies including Cambridge Police had responded to the campus.

The Cambridge Police Department said on its website that it had searched the building with “negative results” and more information would follow.

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Your smartphone pictures will be automatically sharpened, adjusted for light and perfectly toned in a fraction of a second, thanks to a new lightweight chip designed by US researchers.

The device, set to be unveiled by the Massachusetts Institute of Technology (MIT), works by compressing professional software applications into a user-friendly and instant technology for smartphones and tablets. The chip consumes little battery life and can provide the same enhancement for video.

“It’s simple and automatic, the user doesn’t need any photographic expertise,” lead researcher Rahul Rithe told Metro. “If you can point the camera in the right direction the chip will give you a good outcome.”

The ‘picture perfect’ chip is the latest device to offer post-shoot enhancement for amateurs. In 2012, the Lytro camera enabled users to change the focus of images after taking them, making it less important to get the first shot right.

But professional photographers are not panicking yet. “The chip will be great for photographers who don’t understand how to use light,” war photographer Ted Nieters told Metro. “And it won’t change the composition – having better exposure won’t automatically make your shots interesting.”

But that never stopped the legion of Instagram users and Rithe is already in talks with a number of smartphone producers to integrate the device, which should be available for purchase within two years.

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