Police in Nairobi are probing an incident in which unknown people threw a grenade into the residence of wiper leader Kalonzo Musyoka Tuesday night. Specialized security detail were deployed at Musyoka’s Nairobi home for the better part of the day trying to piece together evidence of what transpired last night. The incident has caused panic among NASA fraternity coming on a day when Kalonzo's security detail was withdrawn due to planned swearing in ceremony at Uhuru park.