investigators are looking to pin down the attacker's motive, as julia sieger reports. julia: according to cctv footage, the scene -- the truck was seen touring the area in the promenade for different times in the days leading up to the tragic killing good how could a 19-ton refrigerator lori past security and get so close to a pedestrian area without being stopped by police? semitrailers are indeed prohibited from circulating on the promenade at any time. -- what's more, on all national holidays they are vivid and from entering cities altogether. another lead is .2 security gaps. in the security strategy set up officersolice, police and 20 soldiers were deployed to help secure the promenade itself as well as the 2 previous kilometers on the seafront. there, traffic was diverted to a tunnel. meanwhile, at the entrance of the promenade, just a few barricades were placed on the road, but not on the sidewalk. according to the newspaper, authorities had asked the city of nice to set up checkpoints for the public. but the police said it lacked personnel. we couldn't put more

here's julia sieger with more. julia: in just one month, students will be back in parisian schools.iveryehind on the of this construction site is not an option. it is an important contract for the country. >> we have to clean and polish all the bricks and redo the masonry. paint all the windows. julia: the contract will bring in 85,000 euros to the company, which is simultaneously working on 150 other sites. >> we start our day earlier, and finish later, because we also need to report back to the office of times a week. but it doesn't bother us. julia: a dozen temporary workers were recently hired, twice as many as last year, thanks to a growing number of orders. >> all of the white tags are construction sites, and all of the colors refer to our workers that will be assigned. the board is more full now, as the order book is also growing. there are less and less free slots. julia: the company has orders for the next six months, up from the regular three-month booking period. companies in the construction sector agree that the economy is picking up. >> we are relieved. after eight yea

julia sieger takes a closer look at air france's woes.the busiest usually travel time in france, but the terminals at the airport this wednesday were called as 15% of the air france flights were canceled. >> disgusting. i cannot believe they are on strike this time of year. >> it is just not the right way of doing it. julia: the weeklong strike comes after talks failed to bring a compromise on labor court rules, pay my promotions. ministers want to extend the current record for 17 months while unions want an extension of five years. the company ceo slammed the terms and timing of the latest right. -- latest strike. >> i felt very sad when i heard about this strike. it is unfortunate. our clients have been taken hostage at a time of year that is very important to them. the height of the family holiday period. julia: france is the most visited country in the world. the brexit as well as recent terror attacks in france could affect demand for travel and have a significant impact on the company earnings this year. the number of french and for