Reacting to a letter by singer Sidhu Moose Wala's father Balkaur Singh, Punjab Chief Minister Bhagwant Mann has ordered a probe on the decision to curtail his security detail. "He has already ordered an enquiry at the highest level to enquire into the aspects of security reduction and fix responsibility," his office said. Mr Singh had written to the Chief Minister demanding a probe by central agencies Central Bureau of Investigation and National Investigation Agency into his son's death.