ghaziabad a 19yearold youth was arrested on tuesday after he allegedly threatened his sisterinlaw of throwing acid in siyani gate area here mohit rana had married payal against the wishes of her parents in march according to the complaint their families were against the relationship police said payals sister soni lodged a complaint against mohit today after which he was arrested they said probe into the matter was on in her complaint to police soni said that mohit today threatened her to throw acid on her following which we arrested him a senior police officer we are investigating allegations made by payals sister he said