US stocks end mixed after Fed signals more rate hikes to come

The US Federal Reserve has kept interest rates at their current level but has signaled that borrowing costs will likely rise by another half percentage point by the end of the year. The move was prompted by a stronger-than-expected economy and slower inflation decline. UnitedHealth plunged after warning of a spike in medical costs in Q2, while Tesla shares fell, ending a 13-session winning streak. Advanced Micro Devices gained more than 2% after Reuters suggested Amazon’s cloud computing unit may use its new artificial intelligence chips.