A month on from the Sichuan earthquake, Chinese officials have imposed tight security in some of the damaged areas, apparently to prevent protests.

Police in the city of Dujianyan stopped parents from holding a memorial ceremony at the rubble of a collapsed school where their children died.

Journalists were told they were banned from the city, and some were detained.

Parents have been demanding to know whether poorly-built schools played a part in the deaths of their children.

Thousands of schoolchildren were among the 87,000 people killed or missing after the massive 12 May earthquake.

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Concern over tidal barrage cost

The power generated by the proposed Severn Barrage could be produced more cheaply using other green technologies, a report says.

The £15bn dam across the Severn estuary from Cardiff to Weston-Super-Mare in Somerset could supply 5% of the UK's electricity within 14 years.

But an independent report commissioned by 10 environmental groups said it was not a good use of taxpayers' money.

Campaigners have also spelt out the damage to wildlife it could cause.

Considerable new evidence would be needed to make a large barrage in the Severn estuary an attractive option Says "Matthew Bell, author of the report"

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Lake bursts bank and disappears: 'It was . . . full of life, now it's gone'

LAKE DELTON, Wis. - One of the most scenic getaways for Chicagoans is devastated.

Weekend rains of biblical proportions dumped so much water into Lake Delton that it literally burst its banks.

Tens of thousands of gallons of lake water barreled through the woods, taking with it a roadway, several houses, boats, fish and lake bed. It emptied into the nearby Wisconsin River and was gone in hours.

On Tuesday morning, some 24 hours after the catastrophe, the massive lake is nearly drained. The lake is a muddy moonscape of cracked earth. Fish bake in the sun, flopping until their deaths. Mounds of dead fish are piled high. The shoreline is jagged and cracked. Boats hang in the air suspended by what is left of the docks. In parts, the little water that is left meanders like a silent brook. The roadway and earth that held the river back is now a grand canyon.

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China quake lake 'now draining'

Chinese troops have managed to reduce the water level in an unstable lake formed by last month's earthquake, by channelling water to an abandoned town.

Soldiers used explosives to divert water from Lake Tangjiashan into the quake-damaged town of Beichuan.

Residents had already been evacuated to higher ground, but many watched as water gushed through their town.

Eyewitnesses said they had seen the bodies of quake victims along with TVs and refrigerators in the flood waters.

The BBC's James Reynolds, watching the scene downriver from Beichuan, in Mianyang, says people in the area have come down to watch and take photos of the rising waters.