Melissa Yeager, 27 years old, evacuated her home on the second floor of a building in a low-lying area in Lewes, Del.

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However, BBC Brasil spoke to experts who said 1, 300 people ought to have have been the maximum permitted capacity of the building, based on the club's floor area of 650 square metres (7, 000 square feet).

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Capitol Police evacuated the first floor of the Hart Senate Office Building for more than an hour and questioned a man in the area who had a backpack containing sealed envelopes, but the man was not taken into custody.

CNN: Ricin scare rattles Washington

This time it intends to double its current floor area of 400, 000 square feet (37, 000 m2) by renovating existing rooms and by building anew on to its current site in midtown Manhattan.

ECONOMIST: Modern architecture is back | The