VATICAN CITY -- Pope Benedict XVI urged loyal Catholics in China and Iraq to have courage in the face of persecution and limits on their religious freedom, as the largest number of pilgrims in a decade flocked to celebrate Christmas in Bethlehem.

Bombings in Nigeria and the Philippines left 11 dead and 11 injured, however, and Christians' fears in Iraq also marred the Christmas festivities.

Benedict's traditional holiday speech highlighted the tensions between Beijing and the Vatican and the dangers facing minority Christians in Iraq, where militants have used violent attacks to try to drive them out of the country.

"May the birth of the savior strengthen the spirit of faith, patience and courage of the faithful of the church in mainland China, that they may not lose heart through the limitations imposed on their freedom of religion and conscience but, persevering in fidelity to Christ and his church, may keep alive the flame of hope," Benedict prayed.

In recent weeks, tensions have flared anew between the Vatican and Beijing over the Chinese government's defiance of the pope's authority to name bishops and its insistence that prelates loyal to Rome promote China's state-backed church.

Chinese church officials did not immediately comment late Saturday on the pope's homily.

Speaking from the balcony of St. Peter's Basilica, the pope told tourists and pilgrims in the rain-soaked square in Rome that people living in the world's troublespots should take hope from the "comforting message" of Christmas.

Benedict prayed that Christmas would "ease the pain and bring consolation amid their trials to the beloved Christian communities in Iraq and in the Middle East."

"May the light of Christmas shine forth anew in the land where Jesus was born, and inspire Israelis and Palestinians to strive for a just and peaceful coexistence," Benedict said in his traditional "Urbi et Orbi" address (Latin for 'to the city and to the world').

In Baghdad, hundreds of Christians gathered at a church where Muslim extremists took more than 120 people hostage in an October standoff that ended with 68 dead. Church walls were pockmarked with bullet holes, plastic sheeting hung instead of glass windows and flecks of dried flesh and blood still speckled the ceiling.

After the siege, about 1,000 Christian families fled to the relative safety of northern Iraq, according to U.N. estimates.

"No matter how hard the storms blows, love will save us," Archbishop Matti Shaba Matouka told the worshippers.

The pope also expressed hope that Christmas might inspire more respect for human rights in Afghanistan and Pakistan and "advance reconciliation on the Korean peninsula." He prayed that Christians in Haiti would draw hope for the future despite a devastating earthquake and recent cholera epidemic.

For Africa, Benedict prayed that "horizons of lasting peace and authentic progress" would open up for people in Somalia and Darfur as well as those in the Ivory Coast, where violence has killed scores as President Laurent Gbagbo refuses to step down after an election.

In Bethlehem, it was the busiest Christmas in years.

Over 100,000 pilgrims poured into the West Bank town since Christmas Eve, twice as many as last year, Israeli military officials said, calling that the highest number of holiday visitors in a decade. They spoke on condition of anonymity because they were not authorized to talk to the media.

Pilgrims and tourists posed for pictures and enjoyed the sunshine Saturday while others thronged Bethlehem's Church of the Nativity to attend Mass. Worshippers also packed the Roman Catholic church next to the grotto where the traditional site of Jesus' birth is enshrined.

The town's 2,750 hotel rooms were booked solid for Christmas week. Only one-third of Bethlehem's 50,000 residents are Christian today, down from 75 percent in the 1950s. The rest are Muslims.

"(It's) a really inspiring thing to be in the birthplace of Jesus at Christmas," said Greg Reihardt, 49, from Loveland, Colorado.

Still, visitors entering Bethlehem had to cross through a massive metal gate in the separation barrier that Israel built between Jerusalem and the town during a wave of Palestinian attacks in last decade.

In Nigeria, at least 11 people were killed in multiple Christmas Eve blasts in the country's central region, where tensions often boil over between Christians and Muslims. Gregory Yenlong, the Plateau State information commissioner, said he counted 11 dead bodies at two sites rocked by bombs in the city of Jos. He said no one has claimed responsibility for the attacks.

Another bomb exploded during Christmas Day Mass at a police chapel in the volatile southern Philippines, wounding a priest and 10 churchgoers in Jolo on Jolo Island, a stronghold of al-Qaida-linked militants.

At airports in Paris and Brussels, hundreds of travelers received their own special Christmas present -- a flight out after spending the night curled up on hard terminal floors.

"I've never had such a Christmas before," said Ron Van Kooe, who slept at the Brussels airport terminal. "It's one not to forget."

Holiday travel in the United States also wasn't for the faint of heart. Airlines warned people to think twice before trying to fly on Christmas Day, but alternatives were limited. Snow hampered motorists in the Midwest on Christmas Eve, creating dangerous road conditions, and storms draped the Southeast with a rare white coating.

A forecast for a snowstorm Sunday loomed for the nation's capital, with up to 5 inches (12.5 centimeters) possible for Washington, D.C., a city not used to coping with significant snowfall.

In eastern England, hundreds gathered to watch members of Britain's royal family attend the traditional Christmas morning service at their Sandringham estate. Queen Elizabeth II appeared at St. Mary Magdalene Church bundled in a large furry hat, along with Prince Charles and his wife Camilla and Prince Harry.

Prince William and his fiancee Kate Middleton were not there because William is on Royal Air Force duty in Wales. Middleton is believed to be spending Christmas Day at her family's home in Bucklebury, west of London.

The queen, perhaps taking a page from first lady Michelle Obama's fight against obesity, used her annual televised Christmas Day message to focus on the benefits of sports.

"No team can hope to succeed without cooperation between the players," the queen said. "This sort of positive team spirit can benefit communities, companies and enterprises of all kinds."