US stock index futures slipped on Tuesday, extending a weak run as elevated bond yields and higher oil prices kept investors at bay at the start of September. ^[1] A sharp increase in rate-hike bets has soured sentiment in recent sessions, while renewed clashes in the Middle East have heightened worries that borrowing costs may need to rise to contain price pressures. ^[2] At 6:33 a.m. ET, Dow E-minis were down 212 points or 0.4 per cent, S&P 500 E-minis were down 36.25 points or 0.47 per cent, and Nasdaq 100 E-minis were down 265.25 points or 0.9 per cent. ^[3] The selloff in US Treasuries pushed yields to their highest in months, dampening risk appetite further. ^[4]