SINGAPORE - Former China tour guide Yang Yin was called back by the Commercial Affairs Department to assist with investigations on Friday morning.

The 40-year-old was arrested for criminal breach of trust on Wednesday.

He was taken back to the Gerald Crescent bungalow - where he had lived with 87-year-old widow Madam Chung Khin Chun - on Friday afternoon and was spotted with four plainclothes police officers. Two police vehicles were parked at the bungalow.

This is the latest development in the saga that began in 2008 when Mr Yang met Madam Chung as her private tour guide on a holiday in Beijing. Mr Yang is embroiled in a legal tussle with Madam Chung's niece over the widow's assets believed to be worth $40 million.