A strong earthquake struck northern Myanmar on Sunday, collapsing a bridge and a gold mine, damaging several old Buddhist pagodas and leaving as many as 12 people feared dead.

No casualties or major damage were reported in the nearest major population center, Myanmar's second-biggest city of Mandalay, about 117 kilometers south of the quake's epicenter near the town of Shwebo.

Smaller towns closer to the quake's epicenter were worse-hit.

An official from Myanmar's Meteorological Department said the magnitude-6.8 quake struck at 7:42 am (local time).

The area surrounding the epicenter is underdeveloped, and casualty reports were coming in piecemeal, mostly from local media. Myanmar has a poor official disaster response system, despite having lost about 140,000 people to a devastating cyclone in 2008.

The region is a center for mining of minerals and gemstones, and several mines were reported to have collapsed.

The biggest single death toll was reported by a local administrative officer in Sintku township - on the Irrawaddy River near the quake's epicenter - who said that six people had died there and another 11 were injured.

He said some of the dead were miners who were killed when a gold mine collapsed. He spoke on condition of anonymity because local officials are normally not allowed to release information to the media.

According to news reports, several people died when a bridge under construction across the Irrawaddy River collapsed east of Shwebo. The bridge linked the town of Sintku, 65 km north of Mandalay on the east bank of the Irrawaddy, with Kyaukmyaung on the west bank.

The website of Weekly Eleven magazine said four people were killed and 25 injured when the bridge, which was 80 percent finished, fell. The local government announced a toll of two dead and 16 injured. All of the victims appeared to be workers.

However, a Shwebo police officer, also speaking on condition of anonymity, said just one person was confirmed dead from the bridge's collapse, while five were still unaccounted for.

Weekly Eleven also said two monasteries in Kyaukmyaung collapsed, killing two people.

A report on state television MRTV about eight hours after the quake and two aftershocks struck said three people had died, 29 were injured and four were missing in several locations.

"This is the worst earthquake I felt in my entire life," said Soe Soe, a 52-year-old Shwebo resident.

She said that the huge concrete gate of a local monastery collapsed and that several sculptures from another pagoda in the town were damaged.

Other damage was reported in Mogok, a major gem-mining area just east of the quake's epicenter. Temples were damaged there, as were some abandoned mines.

"Landslides occurred at some old ruby mines, but there were no casualties because these are old mines," said Sein Win, a Mogok resident.

State television reported that more than a dozen pagodas and stupas in five townships were damaged, and many of them had their so-called umbrellas' atop the dome-shaped structures crash down.

The uppermost parts of the domes usually contain encased relics of the Buddha and small Buddha images, and sometimes jewels. Damage to them is taken as an especially bad omen.

Sein Win said police were guarding a damaged stupa in Mogok and its exposed relics.

A resident of Naypyitaw, which is 365 km south of the quake's epicenter, said several windowpanes of the parliament building had broken.

The epicenter is in a region frequently hit by small temblors that usually cause little damage.

The quake was felt in Bangkok, the capital of neighboring Thailand. It comes just a week ahead of a scheduled visit to Myanmar by US President Barack Obama. He will be the first US president to visit the country, which is emerging from decades of military rule.

The disaster is the second to strike the area in three days. On Nov 9, a tanker train derailed about 128 km north of Shwebo, and at least 25 people were killed when overturned carriages burst into flames as they were trying to skim fuel from them.

The Associated Press