The State Department said Wednesday that at least 12 Americans have been injured in the attacks, including Mormon missionary Mason Wells, 19, his two colleagues, a U.S. Air Force officer and the serviceman's five family members.

The 19-year-old suffered a ruptured Achilles tendon, injuries from shrapnel and second- and third-degree burns on his face and hands after the bombing.

Two missionaries who were with Mason also suffered injuries, but survived.

'This is his third terrorist attack,' Chad Wells, Mason's father, told ABC News.

'This is the third time that sadly in our society that we have a connection to a bomb blast
'We live in a dangerous world and not everyone is kind and loving.'

Chad said he and Mason were a block away from the finish line of the Boston Marathon, where the bombing took place, waiting for Mason's mother, Kymberly Wells, who was a runner.

'It had shaken their bodies and he had taken Mason to our hotel and said to stay there.

'Mason was very calm and composed,' Kymberly told ABC News.

Mason is currently in a Belgian hospital and is expected to make a full recovery, he told his parents. He was at 'ground zero' of the blast zone when the bombs went off.

ABC News was there when Mason's parents spoke to him from the hospital. Chad Wells promised to get on the next flight to Paris to visit his son.

'I don't feel like you need to come to Europe but I'm not gonna stop you if you guys...if you want to, Dad,' Mason says during the call. 'The burns aren't too bad at all, so they're pretty sure they're not gonna scar.'

Mason's mother's voice breaks as she asks her son how long he'll be in the hospital, and he says weeks.

'It's a miracle he's alive. It's a blessing from God he's alive,' Chad Wells said. 'He's just grateful to be alive, to have survived this, we're grateful that he survived such a horrible thing, because being right there at ground zero, and right next to the attack - and to survive - is nothing short of a huge miracle.'

Chad said a Mormon official relayed to the Wells family that Mason, 'despite being on the ground and bleeding actually had a sense of humor and remained calm through the situation'.

'Mason has always assured us that he is safe and careful.

'I told him first and foremost always be aware of your surroundings, please be very careful when you're traveling be very observant to people around you,' Kymberly said.

The teen was also in Paris last year during the attacks.

'He shared with us that he was extremely close to the blast where he was burned by it,' Chad said.

'It's a blessing from God he's alive.'

Joseph Empey, who was with Mason, was also injured in the attack.

The 20-year-old was treated for second-degree burns to his hands, face and head.

He also had surgery Tuesday for shrapnel injuries to his legs, but his family said in a statement that the he is recovering and is grateful and in good spirits.

Joseph and Mason were at the airport with 66-year-old Richard Norby when they were wounded by an explosion.

A fourth missionary from France, Fanny Rachel Clain, was in a different location at the airport and was hospitalized with minor injuries.

Also among the Americans injured is Karen Northshield, a personal trainer living and working Brussels.

Friends originally reported her missing on Tuesday, but on Wednesday they found out she was being treated at a local hospital.

Paul Tucker, a personal trainer from the UK who works with Northshield in Brussels, told the Telegraph: 'I have been told this morning that Karen is in hospital in intensive care. She is alive but we don't know her condition or her injuries.

'I think she was flying back to the U.S. for the Easter holidays. She has a sister in Brussels who is with her in hospital. It's very upsetting but that's all I know. I don't know what state she is in in intensive care.'

(Pics - Daily mail)