On October 2, 2006, he was brutally beaten by the local police of Bangladesh, injuring both of his arms.
But his career plans changed when his coach asked him to join the newly organized shooting team of BKSP.
His success was then spotted by the national scouts and he was called at the camp of that year's Commonwealth Games.
[2] Khan took part in the 10 m Air rifle individual event in the 2002 Commonwealth Games at the age of 15.
In 2005 Asian Championship he registered his highest ever total score that earned him a bronze medal finish.
[2] Although Khan got pairs silver with Anjan in 2006 Commonwealth Games, he lost his individual gold that he had achieved four years earlier.
In the Colombo SAF Games, two of his shoot up scores were under ten with a highest of 10.7 where he used to reach 10.8 three to four times.
Khan and his fellow shooters were preparing for the 2006 Asian Games to be held at Doha in November 2006.
[5] Police beat Khan in multiple places and severely injured his left arm and leg.
[8] On November 22, 2008, Khan won two gold medals on the opening day of 4th South Asian Shooting Championship in Islamabad, Pakistan.