(By Sudhin Thanawala, The Associated Press) The chancellor of the University of California, Davis said Saturday that the school was launching an investigation after "chilling" video images surfaced online showing an officer using pepper spray on several protesters as they sit passively with their arms interlocked."The use of the pepper spray as shown on the video is chilling to us all and raises many questions about how best to handle situations like this," Chancellor Linda Katehi said in a message posted on the school's web site.