(distant rapid gunfire) (distant gunfire continues) (gunfire) (speaking foreign language): (loud gunshot) (gunshots, debris falling) (glass breaking) (glass crunching) (distant rapid gunfire) (clicking tongue) (distant shouting) (distant rapid gunfire) (gunshot) (rapid gunfire) (loud explosion, debris falling) (man shouting) (rapid gunfire) (man gasping) (radio chatter) (man gasping) (brakes squealing, men talking) >> 13 years after the U.S.

military invasion, the country still faces profound challenges, none more dire than the threat posed by the Islamic State.

(radio chatter) >> The capture of Mosul in June 2014 shocked the world and became a symbol of the emerging threat of the so-called Islamic State group.

>> There are over a million civilians in Mosul.

ISIS is not letting them leave.

It's using them as human shields.

>> They're describing a life of torture under the Islamic State's brutal rule.

>> The Iraqi prime minister has announced just moments ago the offensive to take back Mosul is now underway.

>> ISIS recognizes that there is a big battle ahead for Mosul, Iraq's second-largest city.

>> This is the place where I.S.

proclaimed its caliphate.

Here it was born, and here, Iraqi forces say, it will die.

(speaking foreign language) (gunshots) (men shouting) (distant rapid gunfire) (distant gunshot) (gunfire, explosion) (rapid gunfire) ANMAR: (gunshots) JAMAL: (speaking foreign language) (explosions, gunfire) HUSSEIN: (distant gunfire) (loud explosion) (gunfire, explosion) (rapid gunfire) (rapid gunfire) (rapid gunfire) (gunfire) ANMAR: (explosion) (firing, rapid gunfire) (voice trembling): (baby crying) (car horn beeping) ANMAR: (hissing) (explosion) >> Whoa!

(dog barking) BOY (on radio): MAN (on radio): BOY: MAN: ♪ ♪ ♪ ♪ (engine stops) HUSSEIN: (gunshot) (distant gunfire) (radio chatter) ANMAR: (distant gunfire, men shouting) (gunshots) (men shouting) (loud gunfire) (gunshots) HUSSEIN: (men shouting) (water bubbling) >> Hello?

(water bubbling) ♪ ♪ (indistinct chatter) ♪ ♪ (laughter) ♪ ♪ JAMAL: (distant gunfire) (distant rapid gunfire) JAMAL: (radio chatter) (distant rapid gunfire) (distant rapid gunfire) (loud rapid gunfire) (loud gunfire continues) (firing stops) HUSSEIN: (distant gunfire) (laughter) (nearby gunshot) (chuckles) (dance music playing) (music continues) (distant rapid gunfire) (metal clanging) ♪ ♪ JAMAL: (men shouting on phone) (rapid gunfire on phone) (sheep bleating) (men shouting) ♪ ♪ ♪ ♪ ANMAR: (people talking) (people talking) (radio chatter) ♪ ♪ (men talking) ♪ ♪ (indistinct chatter) (indistinct chatter) ANMAR: (indistinct chatter) (door thudding, clanging) (fires) (distant explosions) (loud gunshot) BOY: QASSIM: QASSIM: QASSIM: QASSIM: QASSIM: QASSIM: QASSIM: ANMAR: ANMAR: (distant rapid gunfire) (explosion) (distant gunfire) ♪ ♪ MAN (on radio): (radio chatter) (weeping) (continues weeping) (men talking, distant gunshot) HUSSEIN: (distant gunshots) (sniffles) (indistinct chatter) (lighter clicks) (aircraft flying overhead) (metal clinking) (bullets clanging) (man shouting in the distance) ANMAR: (music playing softly) (men chatting) (distant gunfire) (man shouting) (distant gunfire) (gunfire continues, man yelling) MAN (on radio): (explosion roars) (explosion roars) (gunfire in distance) (water bubbling) ANMAR: (faint explosion, gunfire) ♪ ♪ (explosion) ANMAR: (explosions) (rapid gunshots) (rapid gunfire) (distant gunshots) WOMAN: SOLDIER: (distant gunshots) MAN (on radio): (distant rapid gunfire) (gunfire stops) (firing) (distant gunfire) HUSSEIN: (meowing) JAMAL: (distant gunshots) ♪ ♪ (rapid gunfire) (firing) (rapid gunfire echoes) ♪ ♪ ♪ ♪ HUSSEIN: (explosions, gunfire) (rapid gunshots) (fires) (men cheering) (singing, clapping): ♪ ♪ (crickets chirping) JAMAL: ♪ ♪ ♪ ♪ ♪ ♪