Viable letter bomb sent to senior police officer in Northern Ireland

Who polices the police? Six roads closed for several hours? Were there no flag protesting dissident loyalist to give them a hand blocking the queen's highway, since they seem to have considerable experience of late with inexplicable PSNI acquiescence. If they are keeping an open mind, how could they suspect so called dissident republicans? Just how objective can subjective people be? if DRs are responsible, shame on them. If black ops, shame on us.