Nawaz, 68, has been very vocal about Pakistan cricketers and officials links with the top bookmakers and gamblers, in the print and electronic media. He has also filed cases in courts on match and spot-fixing.
However, he has never been able to substantiate his claims.
Nawaz yesterday lodged a complaint with the police in his hometown Islamabad that bookies had threatened him.
"He has now requested for police protection and security for himself and his family and the matter is with the high-ups now," a senior police official in Islamabad said.
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The report says that two men came out from the vehicle and pulled out weapons. One of the men remained in front of the car while the other is said to have approached Nawaz and warned him to stop giving statements against the PCB, players and bookies and to stop pursuing cases in courts.
The pacer, who took 177 Test and 63 One-day International wickets, had filed a similar complaint seven years back.
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