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UPDATE 1-New year jitters for bond markets as ECB cuts back stimulus

* ECB monthly asset purchases drop by half to 30 bln euros

* Bond markets brace for heavy month of supply

* Bund yields at two-month highs

* Peripheral spreads widen

* Euro zone periphery govt bond yields http://tmsnrt.rs/2ii2Bqr (Updates throughout)

LONDON, Jan 2 (Reuters) - Borrowing costs across the euro area shot higher on Tuesday as a cut in monthly ECB asset purchases became a reality, with hawkish comments from a top official and strong data hurting sentiment towards bonds on the first trading day of the year.

Peripheral bonds markets, the biggest beneficiaries of European Central Bank stimulus, bore the brunt of the selling. Yields in Italy, Spain and Portugal rose 6-7 basis points each, widening the gap over German peers.

But even "core" or top-rated bond markets were left unscathed from the selling pressure, with Germany's 10-year bond yield hitting two-month highs.

Benoit Coeure, the Frenchman in charge of carrying out the ECB's bond purchases, sees "a reasonable chance" the 2.55 trillion euro stimulus programme will not be extended again when it expires in September, he told a Chinese financial magazine at the weekend.

The comments highlight that the days of extraordinary monetary stimulus are nearing an end given stronger economic conditions and signs of a pick-up in inflation.

Data on Friday showed inflation in Germany, Europe's biggest economy, hit its highest level in five years in 2017. A survey on Tuesday showed euro zone manufacturers ended 2017 by ramping up activity at the fastest pace in more than two decades.

ECB monthly bond purchases, which have long underpinned bond yields, have fallen to 30 billion euros from 60 billion euros.

That cut in purchases from the start of January, unveiled in October, comes just as investors brace for a hefty month of supply -- a potentially powerful headwind for bond markets.

"While the cut in ECB asset purchases is not a surprise, there is some uncertainty as to how the markets will adjust to this in an unusually heavy month for supply," said Rainer Guntermann, a rates strategist at Commerzbank in Frankfurt.

"The more hawkish commentary from the ECB is also weighing on markets."

Germany's 10-year bond yields rose 2.5 basis points to 0.46 percent, the highest since late October. German 30-year bond yields jumped almost 5 bps to 1.31 percent , their highest since mid-November.

In Italy, where borrowing costs rose last week after the president called a general election for March 4, 10-year bond yields extended their rise to a two-month high just above 2 percent.

That pushed that gap over German equivalents to around 163 bps, its widest in more than two months. Spanish and Portuguese bond spreads also widened against Germany in a sign that investors were reducing their exposure to southern European bond markets.

"The widening in peripheral spreads shows that the market is concluding that the recent spread tightening is inconsistent with a more hawkish ECB," said Peter Chatwell, head of rates strategy at Mizuho.

Analysts said Portuguese five-year bonds were also coming under pressure from expectations of a syndicated bond deal of this maturity next week.

Most other euro zone bond yields were up 2-3 basis points, with trade subdued after Monday's New Year's holiday. There was also some caution ahead of the implementation on Jan. 3 of the wide-ranging EU financial markets directive known as MiFID II.

(Reporting by Dhara Ranasinghe; Additional reporting by Fanny Potkin; Editing by Catherine Evans)