The gunmen were disguised as Pakistani security members .
On May 29 , 2015 , twenty - two passengers on a bus in Mastung , Pakistan were killed by gunmen when they bus they were on was hijacked .
The gunmen were disguised as Pakistan security members .
On May 29 , 2015 , twenty - two passengers on a bus in Mastung , Pakistan were killed by gunmen when they bus they were on was hijacked .