On 23 December 1972, Palme (then Prime Minister) made a speech on Swedish national radio where he compared the ongoing U.S. bombings of Hanoi to historical atrocities, namely the bombing of Guernica, the massacres of Oradour-sur-Glane, Babi Yar, Katyn, Lidice and Sharpeville, and the extermination of Jews and other groups at Treblinka. The US government called the comparison a "gross insult" and once again decided to freeze its diplomatic relations with Sweden (this time the freeze lasted for over a year).