(Adds comments, details and updates stock prices)

By Junko Fujita

TOKYO, April 23 (Reuters) - Japan's Nikkei share average

crossed the 60,000 level for the first time on Thursday, lifted

earlier by technology stocks as risk sentiment improved after

U.S. President Donald Trump extended the ceasefire with Iran.

The index, however, shed early gains in choppy trade

and was little changed by 0127 GMT, after falling as much as

0.7% earlier in the session. It touched a record high of

60,013.98 at its peak.

The broader Topix was also flat at 3,744.93.

Trump said the indefinite extension of the ceasefire

followed a request by Pakistani mediators. However, the U.S.

Navy's blockade of Iranian ports remained in effect, and Iran

seized two ships in the Strait of Hormuz.

"There are still uncertainties surrounding the Middle East

war. The Strait of Hormuz is not completely open and the oil

prices remain high," said Hiroyuki Ueno, chief strategist at

Sumitomo Mitsui Trust Asset Management.

"Investors have bought the shares on optimism for the war's

end until now. But for the index to rise further, they need more

positive cues that support the fundamentals that could also lift

domestic demand-related stocks."

The Nikkei has recouped all losses since the start of the

U.S.-Iran war in late February, though gains have been driven by

a narrow group of artificial intelligence-related stocks,

including SoftBank Group and Advantest ( ADTTF ).

The so-called NT ratio, the Nikkei 225 divided by the

broader Topix, hit a record high of 15.74 on Wednesday,

underscoring how the rally has outpaced the wider market.

Chip-related shares climbed on Thursday, with Advantest ( ADTTF ) and

Tokyo Electron ( TOELF ) up 2.65% and 1.76%, respectively.

Technology investor SoftBank Group jumped 6.4%.

Fibre optic cable maker Fujikura ( FKURF ) gained 0.65%.

Uniqlo-brand owner Fast Retailing ( FRCOF ) fell 1.8% to

weigh on the Nikkei the most.

Of the 1,600 shares on the Tokyo Stock Exchange's prime

market, 17% rose and 78% fell, and 3% traded flat.