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Kenya Administration policemen walk inside Garissa University College in Garissa April 4, 2015. The death toll in an assault by Somali militants on Garissa University College is likely to climb above 147, a government source and media said on Friday, as anger grew among local residents over what they say as a government failure to prevent bloodshed. REUTERS/Goran Tomasevic

GARISSA, Kenya (AP) — Somalia's Islamic extremist group al-Shabab warned Saturday of more attacks in Kenya like the assault on Garissa University College that killed 148 people.

"Kenyan cities will run red with blood," said al-Shabab according to the SITE intelligence monitoring group.

The Islamic militants said the attack on Garissa college was in retaliation for killings carried out by Kenyan troops fighting the rebels in Somalia.

"No amount of precaution or safety measures will be able to guarantee your safety, thwart another attack or prevent another bloodbath," said al-Shabab.