Gold prices fell on Monday as an escalation in the Middle East war pushed Brent crude above $90 a barrel, heightening inflation concerns as several US Federal Reserve policymakers signalled that interest rate hikes may be needed to curb price pressures. Spot gold was down 0.4% at $4,000.55 per ounce, as of 0058 GMT, after hitting a two-week low on Friday and posting a 2.5% weekly loss. U