Guinea-Bissau's sacked prime minister, Carlos Correia, denounced the dismissal of his government by President Jose Mario Vaz as a "constitutional coup d'etat" on Friday, as a new premier was sworn in, according to Reuters. Opponents of Vaz protested outside his presidential palace on Thursday night, burning tyres and throwing rocks, after he named Baciro Dja as the new prime minister. Vaz sacked Correia and his government on May 12, saying they had proved incapable of managing a months-long political crisis. The ruling PAIGC party has been embroiled in a power struggle since last summer, caused partly by the overlapping duties of the president and prime minister in a semi-presidential system. "We are facing a constitutional coup d'etat because the dismissal of my government is unconstitutional," Correia told Reuters. Members of Correia's government were still at their offices on Friday and he said they will not transfer their duties to ministers named by Dja. The PAIGC said in a statement it would not support the new prime minister, who was sworn in on Friday.