* Gold below $1,400, Japanese stocks slip
* Coming Up: U.S. Consumer prices Feb; 1230 GMT
* Gold bars premiums up by half in Tokyo (Updates prices, adds premiums in Tokyo)
By Lewa Pardomuan
SINGAPORE, March 17 (Reuters) - Gold dropped to stay below $1,400 on Thursday as mounting fears about a nuclear catastrophe in Japan prompted investors to sell bullion to cover losses in other markets, but a rise in ETF holdings suggested weaker prices had spurred buying interest.
Premiums for gold bars rose further to as much as $1.50 an ounce in Tokyo, their highest since February, from $1 earlier this week as supply tightened and investors chased the metal after last week's devastating earthquake and tsunami.
Gold fell $6.60 to $1,392.70 an ounce by 0448 GMT.
It struck a record around $1,444 last week, when investors poured money into gold as oil jumped on violence in Libya and after a downgrade of Greece's credit rating reignited worries about euro zone sovereign debt.
"There are mixed views with respect to the catastrophe in Japan. Few sections of investors believe that demand may see a surge in the coming sessions which could take gold to fresh record highs," said Pradeep Unni, senior analyst at Richcomm Global Services in Dubai.
"At the same time there is a view that Japanese retailers or banks may sell gold to raise immediate cash. Banking is completely impossible and cash in hand is either burnt or washed away. This makes gold vulnerable to a sell-off, if situations do not improve."
Japan's Nikkei stock benchmark was down 2 percent on Thursday, cutting earlier losses as investors, shaken by a yen surge and a deepening nuclear power plant crisis, warily picked up shares savaged by heavy selling earlier in the week.
Operators of the nuclear plant again deployed military helicopters in a bid to douse overheating reactors, as U.S. officials warned of the rising risk of a catastrophic radiation leak from spent fuel rods.
U.S. gold futures for April lost $3.5 an ounce to $1,392.6 an ounce.
The world's largest gold-backed exchange-traded fund, SPDR Gold Trust , said its holdings edged up to 1,217.295 tonnes by March 16 from 1,212.745 tonnes by March 15, their lowest since May of last year.
Silver tracked gold lower. Platinum slipped to its weakest since December, while sister metal palladium matched a 3-1/2-month low hit on Wednesday on worries the crisis in Japan could hurt demand for auto catalytic converters.
Toyota Motor and other manufacturers are struggling to restore production in the wake of Japan's worst and biggest tsunami ever, forcing them to absorb costs as factories remain idle. Yet for exporters, persistent yen strength could prove more damaging to profits.
In the physical market, demand from investors in the western part of Japan helped stir up trading in the country which is battling to prevent a nuclear catastrophe. Gold bars were offered at zero premium to the spot London prices last week.
"There's a food shortage here. Airports are jammed and cargoes are disrupted. It's very difficult to import metal from overseas, so Japanese premiums are a bit higher," said a dealer at bullion trading house in Tokyo.
"But there's no problem in the western side of Japan, so we've seen buying on dips from investors from that region."
In Singapore, some dealers quoted premiums for gold bars at $1.10 an ounce to the spot London prices, up from $1 in the previous day due to tighter supplies and a drop in bullion prices.
Brent crude fell by as much as 1 percent on Thursday to below $110 as the worsening nuclear crisis buffeted stock markets, raising questions about the impact of the earthquake on growth and energy demand.
Precious metals prices 0448 GMT Metal Last Change Pct chg YTD pct chg Turnover Spot Gold 1392.70 -6.60 -0.47 -1.88 Spot Silver 34.06 -0.14 -0.41 10.37 Spot Platinum 1667.74 -18.76 -1.11 -5.64 Spot Palladium 690.97 -3.53 -0.51 -13.57 TOCOM Gold 3547.00 -99.00 -2.72 -4.88 90299 TOCOM Platinum 4263.00 -138.00 -3.14 -9.22 29290 TOCOM Silver 85.60 -2.70 -3.06 5.68 1677 TOCOM Palladium 1760.00 -57.00 -3.14 -16.07 852 Euro/Dollar 1.3927 Dollar/Yen 79.03 TOCOM prices in yen per gram. Spot prices in $ per ounce.
(Editing by Clarence Fernandez)
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