BENI, Democratic Republic of Congo—At least 10 people were killed overnight in a raid on the city of Beni in eastern Congo, witnesses said, and a civil society group and a monitoring body said Islamist terrorists were suspected of being behind the attack. Residents said a group of attackers had set several houses on fire in the middle of the night in the city’s Beu district, firing upon people as they exited the buildings and attacking some with machetes. The raid took place just four days after the city, home to thousands of displaced people who fled surrounding areas because of violence, was hit by two blasts, which officials also blamed on the Islamists. Hundreds of people took to Beni’s streets on Thursday morning to protest against the government’s failure to protect the city. Some people built makeshift barricades while others burned tires. “So far we have seen 10 bodies …