A case was registered here against unidentified people for posting "insensitive" material against Islam on microblogging site Twitter, police said Tuesday.

The case was registered by the economic offences wing (EOW) of Delhi Police Saturday following a complaint given Oct 12 by a Delhi-based political analyst Tehseen Poonawalia, 30.

A case has been registered under different provisions of the Indian Penal Code (IPC) and the Information Technology (IT) Act's Section 66 A (sending offensive messages through communication service), police said.

Poonawalia alleged in his complaint that the objectionable material was posted on the site Oct 12.

"...the tweets clearly are violating several provisions of the India Penal Code (IPC) and IT act," alleged Poonawalia.

Poonawalia also mentioned in the complaint that some of the offensive tweets had been posted from Oct 6 onwards.

"These tweets are in flagrant violation as they promote enmity between different groups on the grounds of religion," Poonawalia alleged.

"The tweets were made through different accounts - The Devil_Heart, koolkaran, Naren_reddy23, gitaakapoor, ronejoq and jambokaka," Poonawalia alleged.

The National Commission for Minorities (NCM) last Thursday approached police to identify the culprits and register the case against them.

In a letter to Delhi Police Commissioner Neeraj Kumar, NCM chairperson Wajahat Habibullah pointed to a material on Twitter and said it was "replete with abuse against Islam and the Muslim community".