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International news from the bbc. Will start in france and that prisoner escape is still on the run right now. Two Prison Officers killed and three others wounded. Showing you a couple of the pictures we have this is Surveillance Footage showing a black car that runs into that white van and as you can see, two masked Menjumped Out and fire at the officers. And just to the window there you can see where it appears to be a gunman. The prisoner thatis appears to be a gunman. The prisoner that is been freed is a notorious criminal who is with the gang in marseilles france. Let us see where this hap...

Mask in the fight against covid-19. abc news teaming up with engineers at florida atlantic university to show where particles can escape. the demonstration showing that masks with that metal strip, sealing the nose area, released far fewer particles. n-95 masks offering the best protection. half masking, when the mask sits under your nose, was, of course, least effective. when we come back, the first image and a message from vladimir putin's foe from his hospital bed. which is why it's good to know exactly how you'll get there. for more than 150 years, generations have trusted the strength a...

So it's no problem. >> reporter: this demonstration showing in green how droplets of saliva are reduced when wearing a mask. >> stay healthy. >> reporter: without the mask. >> stay healthy. >> reporter: the mayor of washington, d.c., urging residents to wear masks as it lifts its stay at home order friday. >> we know without a vaccine or a cure that we will see new infections. >> reporter: dr. anthony fauci today saying he is optimistic about a vaccine. >> i still think that we have a good chance, if all the things fall in the right place, that we might have a vaccine that would be deployable ...