A Carl's Junior employee is being heralded a hero for helping save a woman who had been shot in Tuesday's attack on the YouTube headquarters in San Bruno, California.

Supervisor Michael Finney, 21, was taking a bathroom break just after lunch when he heard shots ring out at the YouTube campus across the street.

When he emerged from the bathroom, a woman who was heavily bleeding from the leg was being helped into the restaurant by two friends.

Finney rushed over and tried to help stop the bleeding with the woman's sweatshirt, but it wasn't helping.

Carl's Junior supervisor Michael Finney, 21 (pictured), is being heralded a hero for helping a woman who had been shot in Tuesday's attack on the YouTube headquarters in San Bruno, California

The Carl's Junior, left, where Finney works is located just across the street from the YouTube headquarters, right

'Everyone was figuring out what to do,' Finney told the Mercury News. 'I was trying to stay calm and see what I could do. Everybody is shocked.'

So he ran into the restaurant's office and found a green bungee cord which he used to make a tourniquet.

He then stayed with the woman, who he said looked to be in her 20s, until paramedics arrived and took her to the hospital. He said she was calm the whole time.

'I really don't want to talk about it, all I was trying to do was stay professional, you know I have a job and I represent the store,' Finney told USA Today.

A woman who had been shot in the leg in the attack at YouTube's headquarters came into the Carl's Junior and Finney used a bungee cord to make a tourniquet to stop the bleeding

Finney's co-workers are seen sitting outside after the shocking shooting on Tuesday

Nasim Aghdam, 39, has been identified as the woman who shot a man and two women with a handgun when she stormed YouTube's headquarters in San Bruno, California on Tuesday

Finney says he wants to work his way into management at the restaurant, but eventually go to college, possibly for automotive repair.

'I have an old Honda I bought for $1,000 and it always has a lot of problems but I try and figure out how to fix it,' he says. 'It may take a while. I'm nothing right now but I want to work my way up in life.'

Customer Jesse Pineda, who was at the restaurant with girlfriend Leslie Paladini, ran outside to drag a bleeding woman to safety across the street.

'The chef was freaking out and pointed to a girl in the courtyard, saying "She's dead, she's dead!",' he said.

Manager Thomas Matela said: ' I heard like, 12 gunshots - bam bam bam - and closed my door right away. Not even five minutes went by and all the cops I could imagine showed up. They came fast, and I'm glad they did. There are too many crazy people in this world.'

The gunwoman in Tuesday's attack has been identified as Nasim Aghdam, who had recently complained about the company censoring her videos.

She committed suicide after opening fire and injuring several people at the headquarters.

A surgeon at Zuckerberg San Francisco General Hospital says that they are treating three victims - a 36-year-old man in critical condition, a 32-year-old woman in serious condition and a 27-year-old woman in fair condition.

A man named Denny, who owns a restaurant named Hashes and Brews near the YouTube campus, also spoke out about injured employees rushing to his business in the aftermath of the shooting.

Denny told CBS that he was outside smoking when he heard the gunfire, which he at first thought was a nail gun.

Then three YouTube workers - two men and a woman - came into his business with bleeding wounds. The woman was shot beneath her ankle and had a bullet lodged in her shoe. One of the men was bleeding from the face while the other had blood on his elbow. Denny thought they might have been grazed by bullets.

One of the men said that a woman had opened fire in the patio area of the cafeteria.

His workers offered them water and towels and they left after cleaning themselves up.

'They were all shakey, they were making me shake,' Denny said.