Authorities throughout France are on high alert Friday, one day after a gunman killed a police officer and wounded two people in Paris. Isis is claiming responsibility. A group of high school students from Rochester was in Paris, near the scene of the attack when it happened. The forty students from Brighton High School and five chaperones were safely moved away from the area and sheltered for a while in a store. Thursday was the first day of their 12-day visit to France.