The older brother of South Korean President, Lee Myung Bak, was detained on corruption charges on Wednesday, radio reports have said.
Hours after appearing before a judge on Tuesday, 76-year-old, Lee Sang Deuk was taken to the Seoul Detention Centre.
A district court in Seoul said there was danger that evidence could be destroyed.
The prosecutor accused Lee Sang Deuk, a former legislator, of taking 600 million won ($524,000) from two savings banks.
In return, he was alleged to have helped Solomon Savings Bank and Mirae Savings Bank to avoid regular audits.
The chairman of the Solomon Savings Bank was in detention on charges of making illegal loans.
In May, financial supervisors ordered the closure of both banks as well as two others.
Observers said that the case against Lee Sang Deuk had damaged the standing of the president.
Lee Myung Bak’s five-year term ends in February, and he cannot stand for re-election at the poll in December.