The ` ` will not rest '' until they find those behind killings in Dhaka , official said . They are looking into all possibilities , including whether it was a deliberate revenge attack . 12 people were shot dead , hours after an off - duty officer was killed in an armed robbery . Angry residents took to the streets and set buses on fire to protest the killings .
Police `` will not rest '' until they find those behind killings in Campinas , official says . Authorities are looking into all possibilities , including whether it was a police revenge attack . 12 people were shot dead , hours after an off-duty officer was killed in an attempted robbery . Angry residents took to the streets and set buses on fire to protest the killings .