Police believe the attack was carried out by two people.
However the attacks were carried out in a far more professional way.
The attack was carried out over three days, from 23 to 25 November 1977.
The first attack was carried out on 10 December 1944.
Sell decided that the attack must be carried out without them.
He would not be ready to carry out his attack until the 17 December.
But no evidence has been found that the group had the means to carry out such attacks, he said.
He did not do so, but attacks were carried out on traffic to and from the hospital.
I tell you, quite frankly, such an attack could not have been carried out without inside help.
He suggested the attacks might have been carried out by Americans.
