Prosecutors in Taiwan on Friday questioned the son and daughter-in-law of jailed former Taiwanese leader Chen Shui-bian in connection with his graft case.

Chen, the subject of a complex investigation, was put in custody on Wednesday after a marathon court hearing concluded there was enough evidence to hold him for an unspecified period of time to prevent him from colluding with alleged co-conspirators.

Taiwan law permits suspects to be jailed for up to four months without formal indictments being brought against them.