London - The world welcomed 2007 with skyrockets and rock concerts but in some corners of the globe, the New Year was marked by saber-rattling and bombings.

Fireworks exploded over Sydney's Harbor Bridge as a million onlookers greeted the New Year. In London, thousands of revelers gathered to cheer as Big Ben rang in 2007. But the Thai capital of Bangkok canceled the main celebration after nine bombs exploded across the city, many in crowded tourist areas. Two people were killed and 34 were injured.

In the Australian capital, one of the world's first major cities to see the dawn of the new year, people crammed the harbor shore for a lavish fireworks display celebrating the 25th anniversary of its iconic bridge.

Fireworks explode over the Sydney Opera House and Harbour Bridge during New Year's eve celebrations January 1, 2007. [Reuters]

Thousands of would-be revelers who had gathered at Bangkok's Central World Plaza shopping mall complex for the event were sent home, officials said. Festivities continued in other parts of the city, though, including the famous Patpong Road red light district. Police and army troops with assault rifles, meanwhile, guarded some tourist sites, mass transit stations and traffic circles.

A policeman stands guard after bomb blasts in Bangkok January 1, 2006. [Reuters]

In India, police arrested two suspected Islamic militants about half a mile from the site of New Delhi's main public New Year's Eve celebrations, a report said, citing police.

Pope Benedict XVI prayed at a New Year's Eve service at the Vatican City in Rome that 2007 would bring the world "peace, comfort, justice." But he cast a cold eye on some secular New Year celebrations, saying such social "rites" are "often carried out as an escape from reality."

In London, Big Ben's chimes were relayed by sound systems along the banks of the great, gray River Thames. Crowds flocked to the banks near the Houses of Parliament to watch a light show countdown projected onto the 443-foot London Eye Ferris wheel, followed by a 10-minute fireworks display "big enough and loud enough to be seen ... all over the capital," Mayor Ken Livingstone said.

Fireworks explode over the River Thames in London to celebrate the new year January 1, 2007. [Reuters]

At least a million revelers were expected to pack Times Square in unseasonably warm New York City, to hear singers Christina Aguilera and Toni Braxton cheer and watch a 1,070-pound Waterford Crystal ball fall at midnight.

In North Korea, an editorial carried in all three state-controlled newspapers celebrated the new year by boasting that the country's possession of nuclear weapons "serves as a powerful force for defending peace and security ... and guaranteeing the victorious advance of the cause of independence."

Meanwhile Romania and Bulgaria became the newest members of the European Union at midnight. Fireworks thundered through the sky in the Romanian capital.

"Citizens of Bucharest. Welcome to the EU," EU Enlargement Commissioner Olli Rehn said, standing on a stage with Romania's president and European foreign ministers. The ministers from Germany, Denmark, Austria and Hungary wished Romanians a Happy New Year, and planned to fly Monday to Bulgaria for celebrations there.

High winds and winter storms dampened celebrations in other parts of Europe. In Belfast, Northern Ireland, an outdoor concert that was to feature soul singer Beverley Knight and rock band The Thrills was called off due to the threat of gale-force winds.

Glasgow officials said high winds and rain had forced them to cancel Hogmanay, or traditional New Year's celebrations, in the Scottish city. Edinburgh at the last minute also canceled its Hogmanay party, which was to be headlined by the Pet Shop Boys.

In Belgium, several fireworks displays were canceled after two party tents set up for celebrations in northern Belgium blew away on Saturday.

No official celebrations were planned in Paris, but thousands were expected to congregate along the city's glittering Champs-Elysees to welcome 2007.

In the Philippines, where many believe noisy New Year celebrations drive away evil and misfortune, police threatened to arrest anyone setting off oversized firecrackers.

Despite the warning, 284 people were injured by firecrackers and celebratory gunfire in the two weeks before New Year's Day, a 75 percent rise from last year, Health Secretary Francisco Duque III said.

"I have campaigned every day against firecrackers," Duque said. "But this has become a deeply rooted part of our culture."

In Japan, thousands climbed mountains, some scaling famed Mount Fuji, to greet the first dawn of the year. Police expected crowds on the peaks to reach 15,000.

Many Japanese, ranging from families with children to elderly couples, usually start climbing at night so they can reach the top in time for sunrise.

Police anticipated 95 million visitors to the country's major Buddhist temples and Shinto shrines over the first three days of the new year, as people offer prayers for peace, health and prosperity in one of the few religious rites in which most Japanese regularly take part.

The South African city of Cape Town prepared to celebrate New Year's Eve with a show by the Cape Minstrels.