Bloomberg reported on Wednesday that KKR, the private-equity firm led by Henry Kravis and George Roberts, is seeking $2 billion for its second global  infrastructure fund.

According to sources, KKR Global Infrastructure Investors II LP is trying to gather about twice as much as the prior fund raised in Q2 2012. The fund was KKR's maiden infrastructure vehicle and had a global focus with a particular interest in the US and Europe. It seeks equity positions in brownfield economic and social assets with the scope to examine greenfield opportunities.

Bloomberg reports that KKR's first fund, which started buying assets in 2011 and targets 10-15% annual return, is 60 - 70 % invested.

KKR last month announced an investment in European Locomotive Leasing.

KKR also announced last month the final closing of KKR Energy Income and Growth Fund I (EIGF). EIGF represents a $2.0 billion strategy focused primarily on investing behind the development of North American unconventional oil and gas resources.