1: ( CNN ) This week 's attack on Garissa University College is Al-Shabaab 's fifth major assault in Kenya in the past year and a half . 2: The Thursday massacre was the most deadly assault so far , with 147 dead , easily eclipsing the terrorist group 's most notorious attack , a four-day siege in late September 2013 at the Westgate Mall in Nairobi in which 67 people were killed . 3: Al-Shabaab 's attack on Garissa University College is the group 's deadliest so far in Kenya .
1: This week 's attack on Garissa University College 2: The Thursday massacre 3: Al-Shabaab 's attack on Garissa University College