It should be noted Al-Shabaab -which is also known as AQNA (al-Qaeda in North Africa)- has previously been conclusively identified as maintaining training bases in Mexico (Report from 2011).  It is the same group responsible for the Kenya Mall attacks and has threatened the Mall of America. 

GARISSA, Kenya — Al-Shabaab gunmen rampaged through a university in northeastern Kenya at dawn Thursday, killing 147 people in the group’s deadliest attack in the East African country. Four militants were slain by security forces to end the siege just after dusk.

The masked attackers armed with AK-47s singled out non-Muslim students at Garissa University College and then gunned them down without mercy, survivors said. Others ran for their lives with bullets whistling through the air.

The gunmen had strapped themselves with explosives, Interior Minister Joseph Nkaissery said. When Kenyan officers shot at the four, the attackers exploded “like bombs” and shrapnel from the explosions injured officers, he said.

The men took dozens of hostages in a dormitory for several hours as they battled troops and police before the operation was ended after about 13 hours, witnesses said.

Al-Shabaab spokesman Ali Mohamud Rage said fighters from the Somalia-based extremist group were responsible for the bloodshed. The al Qaeda-linked group has been blamed for a series of attacks in Kenya, including the siege at the Westgate Mall in Nairobi in 2013 that killed 67 people, as well as other violence in the north.

CBS News’ Debora Patta reports that students at Garissa college received letters about a week ago warning them of a possible attack, but it seemed no preventative measures were taken by security services. (read more)