mombasa kenya two staff members kenyan university kill south mombasa tuesday gunmen fire vehicles carry students campus area police chief say identity gunmen unclear police coastal county kwale technical university mombasa tum campus say could robbers militants security poor area convoy police escort somali islamist militants al shabaab frequently carry attack along kenyan coast recruit new members 2015 al shabaab gunmen kill 148 students university kenya garissa town near kenya-somali border attack provoke shock outrage kenya abroad two staff members university kill tuesday attack driver two policemen wound area police chief joseph chebusit tell reuters bus carry students tum ferry hostels campus ukunda class escort van staff college two escort police officer policeman say arm men number 10 emerge bush start fire van front result two ladies staff tum kill van driver van two police officer injure say information attackers accomplices along road monitor movement two vehicles communicate enable attack add treat crime like continue investigations mean rule al shabaab witness want name tell reuters several students flee vehicle gunmen open fire see several students cover blood chebusit say students injure gunmen kill two attack university convoy kenya