Hundreds return to Hong Kong streets as metro, shops shut after violence

 Hong Kong's metro system stayed shut on Saturday, paralysing transport in the Asian financial hub, and malls and shops closed early after a night of chaos in which police shot a teenage boy and protesters torched businesses and metro stations.

Friday's protests across the Chinese-ruled city erupted hours after its embattled leader, Carrie Lam, invoked colonial-era emergency powers for the first time in more than 50 years to ban the face masks demonstrators use to hide their identities.

The night's "extreme violence" justified the use of the emergency law, Beijing-backed Lam said in a television address on Saturday.

"The radical behavior of rioters