Dan Tan, also known as Tan Seet Eng, was arrested on Tuesday for “a suspected involvement in criminal activities”, confirmed Singapore police.

The police did not give further details about his arrest and Tan’s lawyers Thong Chee Kun and Hamidul Haq said they were still trying to find the legal basis for the police’s action to re-arrest him.

The arrest followed the Singapore Court of Appeal’s decision to release Tan after more than two years of detention for allegedly match-fixing football games across Europe, Egypt, South Africa, and Nigeria. Chief Justice Sundaresh Menon, along with two other judges, ruled that the detention was unlawful and there was nothing to suggest that Tan’s alleged overseas match-fixing activities jeopardized public safety, peace and good order in Singapore.

Dubbed by Interpol as “the leader of the world’s most notorious match-fixing syndicate,” Tan was arrested in 2013 along with 13 other suspects and has been detained without trial under the Criminal Law (Temporary Provisions) Act (CLTPA).