Rabbi Chaim Halpern and three other Orthodox men who were arrested in Barnet on Wednesday morning were released by police on Friday.
They have been bailed to return in March pending further inquiries.
Rabbi Halpern, of the Divrei Chaim Synagogue in Golders Green, was arrested in connection with investigations into alleged sexual assault and perverting the course of justice. The other three were questioned on suspicion of perverting the course of justice in connection with his arrest.