Two "suspected devices'' were also discovered at the house in Kirkton Avenue, Blantyre, South Lanarkshire, on Wednesday.
Police Search For ''Dispicable'' Car Thieves
Robbers assaulted a man and stole his car in a ''terrifying ordeal'', police have said.
The man was returning to his car in a business park carpark on the outskirts of Glasgow on Friday evening when two men approached him and demanded his car keys.
When he refused, they produced weapons and struck him on the leg before stealing his silver Skoda and speeding away.
The incident happened at around 5.40pm in Buchanan Business Park, Cumbernauld Road, Stepps.
The robbers sped away on Cumbernauld Road towards the M80.
Both suspects are white and in their late teens or early 20s and were wearing black fleeces with an orange Aggreko emblem, dark trousers and dark shoes
One is 5ft 7 to 5ft 10 tall, of medium build with short black hair and stubble while the other is between 5ft 8in to 6ft tall and slim, with fair hair.
Detective Constable Thomas Kiernan said: ''This was a terrifying ordeal for the victim and extensive inquiries are under way to trace the despicable individuals responsible.
''I would appeal to anyone who was either in the car park or the surrounding area, who may have seen two men matching the above descriptions acting suspiciously to get in touch.
''I would also ask anyone who may have seen a silver Skoda driving at speed along Cumbernauld road to come forward as you may be able to assist with our inquiries.''
Police Scotland can be contacted on 101 or information can be given anonymously to Crimestoppers on 0800 555 111.
Police Scotland said the officer had approached an Audi A4 to speak to the occupants when it was allegedly driven at him.
Audit Scotland's annual review of the sector found there were 220,680 students by headcount in 2015/16, the smallest number since 2006/07.
Fondly known as The Big Yin, he will be recognised for his contribution to society at a university graduation ceremony in the Barony Hall in Glasgow on Thursday.
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