The crime branch of Mumbai police arrested three persons who were trying to sell Ambergris or the vomit of whale valued about Rs 2.7 crore from suburban Mulund, an official said on Wednesday.

On receiving the information, unit-4 of the crime branch along with a forest officer raided a room at the Bomate Chawl on Tuesday evening and picked up three persons with the Ambergris weighing 2.7 kg, he said.