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The US government is offering $27m (£18m) in rewards for information on the whereabouts of six leaders of the Somalia-based al-Shabab group.

The highest reward is $6m for the group's leader Abu Ubaidah.

He replaced Ahmed Abdi Godane, who was killed in a US drone strike last year.

Among those being hunted is Mahad Karate, also known as Abdirahman Mohamed Warsame, believed to be a key player in the attack on a Kenyan university which killed 148 people.

The group, part of al-Qaeda, is battling the UN-backed government in Somalia and has also carried out a string of attacks in neighbouring Kenya.

Yesterday, Kenyan security forces destroyed five suspected al-Shabab hideouts in the Bono forest close to the Somali border, according to the Reuters news agency.

The rewards

$6m for Abu Ubaidah also known as Direye, named al-Shabab leader in September 2014.

$5m for Mahad Karate, also known as Abdirahman Mohamed Warsame, accused of playing key role in Garissa University College attack.

$5m for Ma’alim, who the US thinks is responsible for al-Shabab's recruitment and training.

$5m for Hassan Afgooye who is believed to oversee the financing of al-Shabab.

$3m for Maalim Salman, who the US says has been involved in operations in Africa targeting tourists.

$3m for Ahmed Iman Ali, who the US believes to have recruited Kenyans.