BHP Group Ltd BHP.AX and Rio Tinto Ltd RIO.AX both fell. By Ayushman Ojha May 17 (Reuters) - Australian shares declined on Wednesday, weighed by financials and commodity stocks, while investors continued to ponder over minutes from the Reserve Bank of Australia (RBA) May meeting, which signalled the need for more interest rate hikes. Investors await the RBA's next move after minutes from the its policy meeting, which were released on Tuesday, signalled further rate increases may be required due to persistently high inflation.