A 16-year-old refugee has been arrested at a migrant home in Germany after he was seen 'praying for ISIS' amid fears he was plotting a terror attack.

Officers from the SEK anti-terror unit seized the Aghan teenager, called Mohammad, at a refugee shelter in Cologne - the fifth such arrest in Germany within a week.

The arrest on Tuesday came hours before the interior ministry warned of radicals targeting unaccompanied minors and youths in the camps for recruitment into the ranks of terrorists.

It is understood Mohammad was in contact with other radicals and planning an act of terror.

A 16-year-old refugee has been arrested at a migrant home in Germany after he was seen 'praying for ISIS' amid fears he was plotting a terror attack (file picture)

'According to the information by the State Security Service the teen has radicalised himself in a very short time,' said Cologne police in a statement.

'The evaluation of the available evidence pointed to a serious threat,' it added.

Police also said three refugees were hurt while trying to escape the centre housing 200 migrants when they saw armed officers move in.

The Syrian boy attended one of the mosques of the Turkish community in Cologne and was heard 'praying for Islamic State.' According to a local newspaper the word 'bomb' was also heard by worshippers.

Mohammad's father Jamal denied his son was a radical but was suffering from depression.

Officers from the SEK anti-terror unit seized the Aghan teenager, called Mohammad, at a refugee shelter in Cologne - the fifth such arrest in Germany within a week (file picture)

Ralf Jäger, the interior minister of the state of North-Rein–Westphalia (NRW) where the arrest took place said: 'Europe, including Germany and NRW has long been in the crosshairs of Islamist terrorism. The danger is real and concrete. Our security agencies are therefore on high alert and are checking every lead. This arrest shows it yet again.'

Last week three Syrians suspected of being and ISIS 'sleeper' cell were arrested at their home in northern Germany. Another arrest took place on Monday at a home in Böblingen of a 24-year-old Syrian who came to Germany last year.

He is accused of fighting with Jihadists and belonging to a proscribed terror group. He was caught after leaving a computer on a train with disturbing material on it.

In July, the Federal Criminal Police (BKA) said it was following around 410 leads on possible terrorists among asylum seekers in Germany.