Maharashtra Home Minister Dilip Walse Patil on Tuesday said the intelligence department had sent a letter to police officials concerned on April 4 about a possible protest by MSRTC workers outside NCP chief Sharad Pawar's residence, but still there was a "lapse" and enough security arrangements were not made.

A probe is already on into the lapse, while the deputy commissioner of police (DCP) of zone II has been transferred and a senior inspector of the Gamdevi police station suspended, the minister told reporters.