"He (Raj) was very careful this time and it seems he has consulted some legal experts before making the speech. For taking action, the offence needs to have been complete. And it is difficult to find an explicit threat or provocation in the speech text," a senior police officer said amidst widespread demand for action against MNS chief.

In the speech delivered at Shivaji Park, Raj describes the events leading to his arrest in February chronologically and then asks the audience if the action against him was right or wrong.

"We have to make sure that the case stands in court. During the speech, Raj has also made an emotional appeal to the ward officers and ration card officers uttering the words 'with folded hands' for not giving licenses for petty gains. This can be used as a defence by him," the officer said.

As regards use of foul language, it attracts action under various sections of the Indian Penal Code but is a non-cognisable offence, Mumbai Police Commissioner Hasan Gafoor said.