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Somalia's Islamist al-Shabab militants are recruiting heavily in north-eastern Kenya, according to evidence gathered by the BBC.

The recruitment marks a new tactic for al-Shabab, underscoring fears voiced by Kenyan intelligence services and MPs.

In one town alone, the BBC has learnt of 26 young men whose disappearance was reported to police because they were suspected to have joined the militants.

Al-Shabab attacked a Kenyan university two weeks ago, killing 150 people.

The attack at Garissa was the deadliest yet on Kenyan soil by the militants. One of the gunmen was a Kenyan national.

Al-Shabab's recruitment of fighters in Kenya's own backyard marks a change of tactic for al-Qaeda's affiliate in East Africa.

The BBC has learnt of scores cases of missing young men in the north-eastern town of Isiolo, who later admitted in phone calls to their parents that they had joined the Islamist group.

Only half of those cases have been reported to the police because of fears of reprisals. There are similar concerns in other parts of the country.