Brazil’s president, Luiz Inácio Lula da Silva, has said his government will seek an independent investigation into what he called a “disastrous” police “massacre” that left at least 121 people dead. The dead included a 14-year-old and a 19-year-old who was decapitated and had his head exhibited on a tree. Police say 19 of those killed during Tuesday’s operation were from Pará state of which Belém is capital. Lula said he wanted to see federal police forensic investigators involved in an inquiry into the killings. The massacre has overshadowed the start of Brazil’s climate summit and a visit Prince William is making to Rio ahead of those talks.