| The collapse of the Genoa viaduct in August 
				last year killed 43 people.
 The tax police, in a statement, said they had found evidence 
				that safety reports for some viaducts had been falsified or 
				information had been omitted with the aim of misleading 
				transport ministry inspectors and avoiding further checks.
 
 The three people placed under house arrest are employed by 
				Atlantia's motorway unit Autostrade per l'Italia and maintenance 
				company SPEA Engineering.
 
 Six other people at the same companies were temporarily banned 
				from holding office, the police said on Friday, adding that the 
				offices of the people targeted by the probe had been searched.
 
 Shares in Atlantia quickly fell more than 7% in Milan on news of 
				the house arrests, prompting them to be briefly suspended from 
				trade.
 
 A Milan trader said the arrests had revived concerns that the 
				government could make good on a threat of revoking the company's 
				motorway concession.
 
 The shares resumed trade and were down 6.6% down by 1138 GMT.
 
 Atlantia and the two units have been under scrutiny since the 
				collapse of the Genoa viaduct.
 
 Around 70 employees at Atlantia and the transport ministry are 
				already under investigation in a separate probe into the causes 
				of the disaster.
 
 Atlantia has always denied any wrongdoing.
 
 Autostrade per l'Italia said in a statement that all the 
				viaducts targeted by the investigation were safe, adding it had 
				already moved the officials under house arrest to different 
				jobs.
 
 The company said it would consider possible legal action to 
				protect its reputation.
 
 (Additional reporting by Francesca Landini; Editing by Susan 
				Fenton)
 
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