He offered condolences on Twitter. There was no Office of the President official release. Also the flag at the White House is back at full staff today when typically it remains at half staff until interment.
You are incorrect regarding the flag. Obama BROKE with protocol during his Presidency regarding lowering the flag for 2 Senators. That does not establish a new protocol. The actual protocol is set forth in the Flag Code which was created and passed by Congress (House and Senate) and in it the duration of flag lowering for government officials is set. The correct length of time for the flag to be lowered if a member of Congress dies is day of death +1. Lowering until internment is for other officials.