thomas frieden of the c.d.c. now, turning overseas, there was a bang and suddenly a gaping hole in a jetliner over war-torn somalia today, and margaret brennan has that. >> reporter: cell phone video shot on the plane while still in flight shows oxygen masks blowing in the wind near the hole in the airbus 321. some passengers towards the back of the plane can be seen wearing people were injured. the somali-owned airline was on its way from mogadishu to djibouti, when minutes after in the fuselage. after the smoke cleared he realized quite a chunk of the plane was missing. u.s. intelligence officials are aware of reports that there may have been an explosion but it's unclear if that's from a structural failure or a bomb. scott, the al qaeda-linked terror group al-shabaab controlled part of the country, and isis is expanding its footprint. >> pelley: margaret brennan in the washington newsroom tonight. margaret, thank you. now, five days ahead of super bowl 50, the nfl is studying how to deal with a 58% increase in