Mr Hall said a piece he picked up - a quarter of the section - weighed about 15 lbs (6.8 kg), the equivalent of about three bricks.

BBC: Tenants' anger after slab falls six floors from Wigan flats

In the women's section, Serena Williams thrashed Caroline Garcia 6-1 6-2 to set up a last-16 clash with Romania's 26th seed Sorana Cristea.

CNN: Cash: Only injury can deny Nadal in Paris

It had been left raised up to 4ft (1.2m) along a 0.6-mile (1km) section, about 300ft (91m) below the surface.

BBC: Shell claims progress on North Sea oil leak

In the women's section, defending champion Maria Sharapova eased to a 6-2 6-2 win over Spain's Garbine Muguruza.

CNN: Injured Murray to miss French Open?

In the women's section, Serena Williams thrashed Slovakia's 14th seed Dominika Cibulkova 6-0 6-1 to make it 21 consecutive victories.

CNN: Nadal survives scare at Rome Masters

In the women's section, 16-year-old Ashleigh Barty stunned former French Open champion Francesca Schiavone 6-0 6-3.

CNN: Murray overcomes heat factor

In the men's section, second seed Andy Murray saw off the challenge of Grigor Dimitrov in straight sets (7-6, 6-3) after the Bulgarian also let a decent lead slip.

CNN: Serena survives scare to make Miami quarters

Mr. Zehetbauer separated from his wife in 2009 but was still living with her when he found the 6, 250-square-foot lot in an urban, increasingly gentrified neighborhood in the Northeast section of downtown Portland.

WSJ: The Twin Houses of an Odd Couple