"A team was sent at the board's office at Karkardooma to collect relevant documents, as evidence in connection with the case," said Joint Commissioner of Police M K Meena, who is also the chief of the ACB.
Yesterday, the ACB had registered a case under the Prevention of Corruption Act, based on a complaint alleging malpractice and irregularities committed during examinations conducted by DSSSB for the post of Grade-III level officials.
The complainant had submitted to ACB, a list of allegations including that people in the board made money by selecting candidates through "unfair means".
Also, out of the 42 selected candidates, 21 were close relatives, 70 per cent of them were resident of outer Delhi areas which include Narela, Bawana and Kanjhawla and belonged to same community, the complainant alleged.
The complaint said that candidates were asked to report at the board's examination centre at Shakarpur with ulterior motives, on the pretext of maintaining sanctity of the examination.
The selected canditates also have their roll numbers in sequence and all of them have scored marks which the person sitting a seat ahead of them scored in the examination, the complaint said.