* Ferry with 120 aboard sinks after collision
* At least 37 dead, more than 100 taken to hospital
* Survivors say passengers trapped in flooded ferry
* Government vows thorough investigation
(New throughout)
HONG KONG, Oct 2 (Reuters) - Hong Kong police arrested six
crew on Tuesday after a ferry and a company boat carrying more
than 120 staff and family celebrating the mid-autumn festival
collided, killing 37 people as the boat sank.
The boat, belonging to Hongkong Electric Co, controlled by
billionaire Li Ka-shing, was taking passengers to watch
fireworks in the city's Victoria Harbour on Monday when the two
vessels collided near the picturesque outlying island of Lamma.
Five children were among the dead. More than 100 people were
taken to hospital, with nine suffering serious injuries or in
critical condition, the government said in a statement.
"We suspect that somebody did not fulfil their
responsibility, that's why we made the arrests," Police
Commissioner Andy Tsang said. "We do not rule out the
possibility that further arrests will be made."
The arrests involved crew of both vessels.
The collision sparked a major rescue involving dive teams,
helicopters and boats that saw scores plucked from the sea. A
large crane on a barge was connected to the stricken boat.
"Within 10 minutes, the ship had sunk. We had to wait at
least 20 minutes before we were rescued," said one male
survivor, wrapped in a blanket.
Survivors said people had to break windows to swim to the
surface. "We thought we were going to die. Everyone was trapped
inside," said a middle-aged woman.
The fireworks marked the mid-autumn festival, when the moon
is full, and China's National Day. Hong Kong returned to Chinese
from British rule in 1997.
Hongkong Electric, a unit of Power Assets Holdings
which is controlled by Asia's richest man Li, said the boat had
capacity to hold up to 200 people.
The tragedy was the worst to hit Hong Kong since 1996 when
more than 40 people died in a fire in a commercial building.
"OUR CAPTAIN IS NOT WELL"
The ferry, owned by Hong Kong and Kowloon Ferry Holdings,
suffered a badly damaged bow in the collision but made it safely
to the pier on Lamma, an island popular with tourists and
expatriates about a half-hour away from downtown Hong Kong.
Several of its roughly 100 passengers and crew were injured.
"After the accident, it was all chaos and people were
crying. Then water began seeping in and the vessel began to tilt
to one side and people were all told to stand on the other side
and everyone started putting on life jackets," a passenger said.
Hong Kong is home to one of the world's busiest shipping
lanes, but serious accidents are rare. The city is known for its
high-quality public services and advanced infrastructure.
A spokeswoman for Hong Kong and Kowloon Ferry said the
company was trying to assess what happened.
"Our captain is not well and we have not been able to talk
to him so far," the spokeswoman told local television.
A Hong Kong Fire Services official said the search was
hampered by the vessel being partly sunken, poor visibility and
too much clutter. The search for survivors was continuing on
Tuesday.
Teams of men in white coats, green rubber gloves and yellow
helmets carried corpses off a police launch in body bags.
At one of the city's public mortuaries, around 50 grieving
relatives gathered, some crying, while others were called in to
identify the dead.
Hong Kong leader Leung Chun-ying visited survivors and
pledged a thorough investigation. He declared three days of
mourning starting on Thursday.
Thousands of Hong Kong residents live on outlying islands
such as Lamma, which lies about three km (two miles) southwest
of Hong Kong Island.
(Additional reporting by Stefanie McIntyre, Donny Kwok, Farah
Master, Venus Wu and Tyrone Siu; Writing by Anne Marie Roantree;
Editing by Nick Macfie)

