Bose had vowed to "take action at midnight" yesterday, following which the letters were sent last midnight. The Governor told mediapersons on Saturday, "Wait for the stroke of midnight today (Saturday midnight). You will see the action.""The Hon'ble Governor of West Bengal has signed two confidential letters (sealed) tonight, one to Nabanna and the other to Delhi," a statement released by Raj Bhawan last night as said by Bose. However, the details of the letter are yet to be known.