BERLIN (AP) - More than 80,000 emergency personnel, including firefighters and soldiers, were on duty on Saturday, working aggressively to contain the most dramatic floods in Germany in a decade. Thousands of residents were still unable to return to their homes, and bridges and streets were impassable in many regions of eastern and southern Germany.

Twenty people reportedly have already died in the floods across central Europe after several days of heavy rains. Thousands have been put up in emergency shelters waiting for the waters to recede so they can get back to their homes.

German news agency DPA said people in Magdeburg in Saxony-Anhalt were anxiously waiting downstream as the crest of the Elbe River approached on Saturday. The authorities evacuated a nursing home and turned off electricity in several parts of the city. Where the Saale river meets the Elbe, about 3,000 people had to leave their homes.

"The coming days will be extreme and difficult," Magdeburg Mayor Lutz Truemper told DPA.

High water levels were also reported in Hungary, Slovakia and the Czech Republic, while thousands of people in Austria were busy shoveling away mud left by the receding floodwaters of the Danube.

In Hungary, around 2,000 residents of the town of Gyorujfalu, north-west of the capital of Budapest, were evacuated because the authorities were afraid the levees would not withstand the pressure of the Danube's waters. Another 980 residents had to leave their homes along the river out of precaution.

Hundreds of volunteers and military personnel were helping shore up the defenses along the Danube in Szentendre, a town 22km north of Budapest, while military reservists from other Hungarian counties filled sandbags and packed them on top of walls along the river, which was expected to peak here on Sunday at about 40cm above its current record of 7.6m.

A mobile flood wall of about 330m long and 2.5m tall was assembled in eight hours alongside the river promenade in the town earlier this week, and is protecting its picturesque centre.

"After the floods of 2002 and 2006, the promenade wall became very weak and we decided to tear it down," said Mr Ferenc Dietz, Szentendre's mayor. "We decided to put up a mobile flood wall, in part because it provides total security."

The rising waters of the Danube, Europe's biggest river, were expected to reach Budapest on Monday. The water levels were already at 8.6m on Saturday and expected to rise to 8.95m at the peak of the flood - inching close up to the top of the river's flood fences, which are 9.3m tall. In one of the most devastating floods, in 1838, the Danube killed 150 people and left over 50,000 others homeless.

In Slovakia, the Danube was still on the rise in the towns of Sturovo and Komarno near the Hungarian border. The situation in Komarno was especially critical as several protective barriers started leaking and volunteers had arrived to reinforce them with sandbags.

In the Czech Republic, the waters were dropping further and clean-up work was under way. However, anti-flood measures were to remain in place as heavy rains and thunderstorms were forecast for the weekend.