SINGAPORE: Oil futures rebounded more than $1 a barrel from seven-week lows on Wednesday after the killing of Hamas leader Ismail Haniyeh in Iran ratcheted up tensions in the Middle East, but prices stayed under pressure from concerns about weak China demand. Brent crude futures climbed $1.39, or 1.8 percent, to $80.02 a barrel by 8:25 a.m. Saudi time ahead of expiry on Wednesday, while the more active October contract was at $79.41, up $1.34.