Kenyan police are investigating the reported disappearance of former Foreign Minister Raphael Tuju, amid claims he may have been abducted.

According to Tuju's family, the ex-minister and his driver went missing as they were on their way to an evening radio interview on Saturday.

Police said his vehicle was found abandoned with its hazard lights on along a road in Karen, an upmarket suburb of the capital, Nairobi. They said they could not reach him as his phone was switched off.

The former minister, who served in several roles including foreign minister, has been embroiled in a long-running legal battle contesting the auction and takeover of his properties in Nairobi over an unsettled bank loan.

He recently alleged that dozens of police officers had raided his property in Karen, ejected his staff and security guards and taken control of the business premises.