The Delhi Development Authority had carried out a demolition drive on October 30 at the Kathputli Colony in Shadipur and the journalist of 'The Quint', Kshitij Kumar, was covering it.
In the letter, the news portal has claimed that Kumar was "arbitrarily and wrongfully taken into preventive detention by the Delhi Police".
Despite Kumar informing the police that he was a journalist, his plea to be freed was disregarded, the letter said.
They have also demanded an "official apology" from the Ministry of Home Affairs, under whose authority the Delhi Police operates.
A senior Home Ministry official said they are looking into the matter.
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