The caller was outraged by the London Bridge terror attack which killed 7 people and left 48 people injured on Saturday night.
Talking to BBC Radio London's Petrie Hosken, the caller urged the Government to crack down on potential terrorists.
He said: “It needs looking into. And another point now Theresa May has made this statement. We know there are thousands of people they’re watching.
“Let’s not watch them. What happened before we watch them until someone does something, it’s too late then. Round them up, internment.
The furious caller urged the Government to crack down on potential terrorists in the UK
“If they seem to have any sort of information, get them out.
“It’s the same ‘mandy-pandy’ status it’s become, frightened to do the wrong thing.
“It's not the wrong thing, it’s the right thing.”
The caller then claimed politicians should “listen” to what the people want, reiterating that more needed to be done.
He added: “If any politician would actually listen to the people for a change.
What happened before we watch them until someone does something, it’s too late then
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“I’m in all sorts of circles with people and nobody has told me what I think [is wrong].
“It’s an obvious fact that the British people have had enough and something needs to be done.
“These people are being watched, round them up.”
To those who were born in Britain, the angry caller insisted the UK should “keep them in prison, end of”.
He added: “What’s happening is people are watching these people and you heard their neighbours saying ‘oh was a nice bloke he helps with the community, blah blah’.
“And then bang on a Saturday evening he decides to go out and do that with a couple of his friends.
“No, if you have got any inclination in that way at all, internment, if they are born in this country, internment forever, that’s it, end of.”
London terror raids Sun, June 4, 2017
Police have raided a block of flats in Barking in connection with last night's London Bridge terror attack.
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As police continue their investigations following the June 3 terror attacks, a block of flats in Barking is raided for possible suspects
Speaking on Sky News, the Met commissioner, Cressida Dick, admitted that the scale of potential terrorists was huge.
She said: “I would just remind people that we do have literally thousands, in fact, tens of thousands of people who we would regard as subjects of interest.
“Actually when we have fantastic powers of intelligence operations we will know something about a lot of people.
“Our challenge is toward out, first of all, to find out about the people we don’t know about, and then secondly to find out what risk those that we do know about, pose at any one time. It’s a challenging task because we are dealing with very high volumes.
Seven people were killed, and 48 injured, in the terror attack in London, before the three suspected attackers were killed by police at London Borough Market.
Properties in Barking, East Ham and Newham, have been subject to police raids with a number of arrests made.