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The number of people listed as missing after the collapse of a 12-storey building in the US city of Miami has risen to 159, officials say.

( L3 D% _3 l9 S  s" N: s9 eFour people are known to have died.
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  H/ N: R4 ?$ C9 p1 [0 V4 O6 rThe mayor of Miami-Dade says they "still have hope" of finding survivors. Search teams working around the clock have reported hearing people banging beneath the debris.
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! y* O" a& ~& r/ R4 mWhat caused the 40-year-old building to collapse early on Thursday morning remains unclear.

1 d; O0 z, x* k. T. U# ^At least 102 people have now been accounted for, but it is uncertain how many were in the building when it came down. Dozens of people have been evacuated from what is left of the structure.

- r* w" F0 T9 J4 U+ k$ I" E2 uFearful relatives hunt news of Miami missing
. e9 g4 L& e; ?% F5 r; `9 zMiami collapse: What happened? A visual guide
It 'felt like an earthquake'
In pictures: Rescuers search rubble
/ s$ j' B( h& T$ e) T0 H7 ?( J6 kPresident Joe Biden has approved an emergency declaration for Florida, meaning the Federal Emergency Management Agency (Fema) will help state agencies with the relief effort.
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0 r+ z6 h$ I) _. zOvernight hundreds of rescuers used sonar cameras and specially trained dogs as they scoured the rubble for survivors. Teams were tunnelling from an underground car park below the building in an effort to reach victims.