A threat letter was hurled into the home of Swapna Sujeet Patkar, a witness in the Enforcement Directorate's money laundering probe tied to the alleged Patra Chawl land scam, in Mumbai on Wednesday, a police official said.

According to the Vakola police official, a bottle was thrown into Patkar's bungalow in the Kalina area around 1 am. When she inquired with her bodyguard and other employees, she was told that it contained a letter.