A、He was shot dead. B、He was arrested on the spot. C、He was charged with murder. D、He fled two hours later. A新闻中提到，两小时后，突尼斯安全部队将

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?