A、About 115 people. B、At least 62 people. C、More than 40 people. D、At least 22 people. D新闻中提到，至少22人在这次枪击事件中丧生，另外40余人受伤。

Twenty tourists were among the victims of an attack by a gunman at one of Tunisia’s most prestigious museums. The attacker shot dead visitors from South Africa, Poland, Italy and Spain as they were getting off a bus outside the Bardo Museum in the capital Tunis which stands next to the country’s parliament. At least 22 people died in the attack and more than 40 others were wounded. Two hours later Tunisian security forces shot the gunman dead. The last group of tourists were taken away on a bus a while ago, wailing at bystanders and security forces and many Tunisians here are reluctant to leave. The attacker has managed to strike both at political as well at the economic heart of the country. The site of the attack，the Bardo Museum, is to Tunis what Louvre is to Paris. It’s in walking distance to parliament where terrified politicians were locked down when the attack began. This is the first attack on civilians in decades. As an act of solidarity with victims, politicians have been gathering this evening.
5. How many people were killed in the attack?
6. What happened to the gunman?
7. When the attack happened, what did the politicians do?