Former Congress MP Sajjan Kumar, whom the CBI has failed to arrest despite a non-bailable warrant against him in anti-Sikh riots cases, is "missing" for the past one week and his Personal Security Officer (PSO) has been suspended.

Delhi Police Constable Ram Niroha, posted as the PSO of the Congress leader and Z+ category protectee, had approached the Security Wing on February 19 informing them that Kumar had gone missing from that day.

Sources said Niroha, posted with the Security Wing, was suspended from service and a probe is on to establish the veracity of his claims.

Police has stationed a PCR van outside Kumar's residence in Madipur. His brother Ramesh Kumar is MP from South Delhi constituency.

"It seems Kumar has gone underground to evade arrest," a senior police official said.

Kumar could not be contacted for comments. His lawyer had earlier told the court that he was not running away and was just exploring all statutory remedies available to him by approaching a higher court.

The CBI had on February 23 informed the court that they could not arrest Kumar as he could not be located, prompting the judge to slam the investigating agency for "not being serious in apprehending" the Congress leader.