Two men were arrested in Chorley after a stopped car was found to have £10,000 inside.
Police saw a white Citroen Berlingo on the M61 being driven at high speeds and stopped it in the Chorley area.
The car was searched and around £10,000 was found. The money and the vehicle were seized by police.
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Two men, 51 from Derby and 65 from Bedford, were arrested on suspicion of money laundering and are in custody.
Police also reported two incidents on the wider Lancashire road network.
A blue Audi A3 was stopped on the M6 around the Lancaster area with the same result – two arrests, £10,000 and a car seized.
And in Morecambe, mounted officers were on patrol when they stopped a man. He was found to have £5,000 and a search of his home later found a large amount of suspected cannabis and even more cash.
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