Read this and answer the question

Luis Cabral, brother of Amilcar and co-founder of PAIGC, was appointed the first President of Guinea-Bissau. Following independence, the PAIGC killed thousands of local Guinean soldiers who had fought along with the Portuguese Army against guerrillas. Some escaped to settle in Portugal or other African nations. One of the massacres occurred in the town of Bissora. In 1980 the PAIGC acknowledged in its newspaper No Pintcha (dated 29 November 1980) that many Gueinean soldiers had been executed and buried in unmarked collective graves in the woods of Cumera, Portogole, and Mansaba.

When did the PAIGC acknowledge the executions?
29 November 1980