A Subway franchisee and his wife were found executed in their home, in a gated community in Spring, Texas, on Saturday.

Bao and Jenny Lam's adult son Richard called police to conduct a welfare check on his parents this weekend when he hadn't heard from them in two days.

Police broke into the two-story home around 9pm and found the couple bound and shot dead on the first floor.

The home - located in the gated Northgate Country Club community - was ransacked, with firearms and other items missing.

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Bao and Jenny Lam, both 61, were found executed in their Spring, Texas home on Saturday

Police say the couple were found bound and shot on the first floor of their home (pictured) in a gated community late Saturday night

'Everything was disturbed,' said Harris County Sheriff Ed Gonzalez told KTRK. 'Furniture was overturned, drawers were opened. It will take some time to process the scene.'

It appears that the couple, both aged 61, were targeted as they parked their car in the garage, and that they could have been dead for up to three days before their bodies were found.

A source told KTRK that the double murder does not appear to be random, and that the couple was likely targeted.

It's unclear if the crime was perhaps motivated by money; Mr Lam was the owner of six Subway sandwich shops in the Houston area.

The couple's adult son Richard (pictured) called police to conduct a welfare check on his parents after not hearing from them in two days

Richard shared these pictures of him and his parents after their bodies were found this weekend

'It's very scary. That's why I am worried right now,' one neighbor said. 'You don't know what is going on next door.'

Police are hopeful that surveillance cameras in the neighborhood will help them nab the person or persons responsible.

Anyone with information on the double murder is being asked to call the Harris County Sheriff's Office at 713-274-9100 or CrimeStoppers at 713-222-TIPS.