This is a suspected attacker.

Within hours of the attack, this video appeared on social media.

Another shows the apparent weapon a knife on the floor eye witnesses say the man was standing in line during afternoon prayers and suddenly silently stabbed a worshipper praying in front of him.

The victim in his seventies believed to be the more Rosen.

The man who leads the call to prayer is now in hospital.

His injuries are not believed to be life threatening.

The suspect, a 29 year old man, was led away to a central London police station and is now being questioned on suspicion of attempted murder.

We will shock.

We don't know what's happened.

We saw the guy on the floor on, but I didn't got blood.

Soldier on the knife from the floor.

Yeah.

20 people behind this prayers were just starting.

Yeah, it starts.

Yeah, And he was waiting for him, I think to start right, he came from behind.

You know he was behind him.

He probably yes.

Let's get on with.

It was stopped.

Yeah.

Yeah, and he was behind him, you know, he was crying behind him.

We just start to say on lower traumatic, traumatic experience because it's a situation where you're watching someday trying to murder someone in front of you literally meters in front of you know So um but what do you think would have happened if he hadn't stopped?

Well, he stabbed you, stabbing him in the neck.

Police are not treating the incident as a terror attack on the suspects.

Motives are still unclear.

There are conflicting reports from worshippers about whether the attacker had been seen at the mosque before.

The prime minister tweeted a statement expressing his sadness, saying, It's so awful that this should happen, especially in a place of worship, my thoughts that would victim on all those affected.

Last year, like many other mosques, security was increased here in Regent's Park following the terror attack in Christ Church in New Zealand, where 51 people were killed.

The Muslim Council of Britain says it's now re issuing safety advice as communities around the country way up how to continue keeping mosques is open spaces while still protecting worshippers.

When our reporter Simeon Brown is at London Central Mosque for us tonight, Simeon, what can you tell us about what happened today?

I mean, earlier, there was a deep intake of breath following the news that happened in Germany when we heard about the news of the attack here.

Now, of course, the motivations are unknown.

The police on the most themselves are not treating it like a terror attack.

One of the things that that we've heard from the grounds that the man was believed to have been a visitor in the past Here the man has been arrested, is 29 years old and the man who was stabbed demanded We believed to have been coming here over the past 30 years.

And he's the man responsible for making the call to prayer.

Earlier, we spoke to the director general of the mosque, and he was almost believe that the attack was that more severe on not only that he himself treating it like a I think the incidents it's already Islam is a part of your open now.

Yes, way Don't see that as they are.

They are not all let's say they are like like is elated or they are not part of the society on this.

This center, especially, is working in many fields, working with the government, working with the civil society, working with all communities also together.

What is it like when there's like an attack on a plate?

Well, it's awful.

We don't like it, of course, and we are so sorry.

This happened in the mosque and hopefully it's it's individual attack and there isn't there is nothing further we detained in your security.

Well, try toe off course.

So to remedy if there is any gap or any problem, we try to do that.

Definitely.

That's Dr our model Dubai in from London Central Mosque there.