Police officials in Malaysia are looking for seven more individuals who may be connected to the killing of North Korean leader Kim Jong-un’s estranged half brother, Kim Jong-nam. According to Malaysian officials, four of the individuals being sought are North Korean men who left Malaysia on the day Kim Jong-nam was killed. He died at the Kuala Lumpur airport last Monday after he was allegedly poisoned by two women. South Korea has blamed the north for the killing, which has been described as an assassination. Officials have not indicated a cause of death, but Malaysia’s deputy inspector-general of police, Noor Rashid Ibrahim, said on Sunday that the death was “sudden and suspicious.” The two women reportedly believed that they were engaging in a prank, but officials would not comment on that suggestion.