The CBI said that Mr Singh had allegedly demanded Rs 2.2 lakh from the complainant whose firm provided security guards and subordinate staff to the department.

Sanjay Pratap Singh, a senior bureaucrat in the Delhi government, has been detained by the Central Bureau of Investigation in a bribery case, the agency said.The 1984 batch Indian Administrative Service officer is the Principal Secretary of the Department of Welfare of Scheduled Caste, Scheduled Tribes and Minorities in the Delhi government.The CBI said that Mr Singh had allegedly demanded Rs 2.2 lakh from the complainant whose firm provided security guards and subordinate staff to the department.After the complainant approached Delhi Chief Minister Arvind Kejriwal, he sought the help of the CBI in setting up a trap and catching the officer red-handed, the Press Trust of India reported, quoting a government spokesperson.The private assistant of the senior bureaucrat has also been detained.