* Brent touches 3-wk low near $107 on Japan, rebounds toward $110
* "No significant impact" from quake on oil shipments -Intertanko
* Japan crisis solutions seen as last-ditch efforts
* Security forces attempt to clear Bahrain protesters (Recasts with price gain, adds broker, OPEC comments)
By Alejandro Barbajosa
SINGAPORE, March 16 (Reuters) - Brent crude rose $1 towards $110 after Bahraini security forces cracked down on protesters on Wednesday, rebounding from a three-week low near $107 earlier in the day on pessimism about Japan's nuclear crisis.
Helicopters flew overhead and Bahraini police fired teargas on Wednesday as they cleared protesters from a central roundabout that had become the symbol of an uprising by the island's Shi'ite Muslim majority.
Brent for April rose $1 to $109.52 a barrel by 0353 GMT, rebounding from $107.35, the lowest price since Feb. 23, and tracking a bounce in Japan's Nikkei average as hedge funds rushed to covered short positions in futures.
Prices reached almost $120 on Feb. 24 as violence escalated in Libya, disrupting oil output. They slumped 4.5 percent on Tuesday, the biggest drop in more than a year, as Japan's nuclear crisis slashed confidence across markets.
"The Middle East tension that is coming from Bahrain is a positive factor for the oil market," said Ken Hasegawa, a commodity derivatives manager at Japan's Newedge brokerage.
"After the earthquake and the nuclear plant problem in Japan, all markets showed a big decline. Therefore what we are seeing now is a natural rebound. It is still possible that the decline will continue," Hasegawa said, highlighting pervasive volatility in oil markets.
April Brent, the front-month contract expiring on Wednesday, earlier fell more than $1 after another fire broke out and radiation levels rose at the earthquake-crippled Fukushima nuclear plant north of Tokyo.
Bahrain's king declared martial law on Tuesday as his government struggled to quell an uprising by the island's Shi'ite Muslim majority that has drawn in troops from fellow Sunni-ruled neighbour Saudi Arabia.
The island state lies less than 100 kilometres from the hub of the Saudi oil industry around Dhahran, including the world's largest oil fields, terminals and processing facilities.
U.S. crude touched $96.22 on Wednesday, the lowest price this month, before rebounding to $97.98, up 80 cents.
But oil prices have yet to benefit from an expected increase in Japanese demand for gasoil and fuel oil for power generation to replace some of the nuclear capacity lost following Friday's earthquake and tsunami. Brent has dropped 5 percent since the quake struck.
Oil shipments to Japan have not been significantly affected by the earthquake and subsequent nuclear crisis, a top shipping industry group said on Wednesday.
OPEC could meet to assess crude oil demand and supply after the crisis in Japan, Nigeria's foreign minister said on Wednesday.
Academics and nuclear experts agree that the solutions being proposed to contain damage to the Daiichi reactors at Fukushima, 240 km (150 miles) north of Tokyo, are last-ditch efforts to stem what could well be remembered as one of the world's worst industrial disasters.
In Libya, Muammar Gaddafi's government forces pushed eastwards towards the rebel stronghold of Benghazi and his government predicted victory within days while world powers debated imposing a no-fly zone to help stop him.
Libya's oil output, normally about 1.6 million barrels per day and down by at least two-thirds, will take some time to return to normal, the head of the National Oil Corporation said on Tuesday, because some installations have been damaged in fighting between rebel and government forces.
Shokri Ghanem also told Reuters that Libyan oil installations at Ras Lanuf, Brega, Es Sider and Mellitah were "completely" under central control and oil workers were assessing the condition of facilities.
Sustained high oil prices will damage world economic recovery, the International Energy Agency said on Tuesday, as it warned that OPEC's cushion of spare oil output to calm the market was at its lowest for four years. (Editing by Clarence Fernandez)