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crews were doing construction work in the cafeteria at the longworth building.workers started feeling ill from some kind of fuel. the building has not yet been evacuated. a hazardous materials team is on scene. we will learn more and update you. is getting ready for his spotlight at the national zoo. morning, yourrow will finally be able to see the panda cub. as john gonzalez explains, you should expect panda-monium. john: bei bei finally making his debut. at the asia trail, folks getting -- working hard. they are doing painting. they already placed signs out less than 24 hours before the public will line up. it says "yet in line early" because it will be very busy. across the path, the gift shop is open and have been busy stacking up their panda merchandise. xiang had the twins, thousands of people have been locking on to the panda cam. logging onto the panda cam. , the00 tomorrow morning public will finally be able to -- and the zoo and cdc's see d.c.'s newest celebrity. >> it will be amazing. i think people will be so excited. is about new panda cub 22 pounds