American movie, in English, color, was on HBO in the early-mid 80s
It was a thriller / suspense type movie. There was a guy holding hostages in a large white mansion. He negotiated with police who provided him with a means of escape (helicopter or boat?); however, the snipers were ready for him. When he made his getaway, he surrounded himself with hostages and covered the whole group with a large bed sheet as he crossed a huge green lawn outwitting the cops.
I was unable to finish the movie, and I have been unable to remember the title for over 30 years. Please help!! I wish that I could remember more, but I was too young.
Thanks all !!