Starr International Co, an investment vehicle controlled by former AIG chairman Maurice 'Hank' Greenberg, has tied up with private-equity firm AID Partners Capital Ltd to invest in China's Tianjin Infrastructure Group, the Wall Street Journal reported.

Starr and AID will become strategic partners and minority investors in the state-owned group, the newspaper reported.

The report did not provide financial details of the investment.

Tianjin Infrastructure Group controls Tianjin's transportation network and is responsible for the finance, construction and operation of several civil construction projects in the northern Chinese city.