Brent crude oil was flat Monday, with U.S. oil ending at a one month low in choppy trading as reports of restarted production at a Libyan oilfield, which hinted at more supply.
Libya's armed forces warned they would not allow any oil tanker to load at ports seized by protesters. The Libyan Navy had blocked a Maltese-flagged vessel from trying to reach a dock and opened fire as it approached a port, officials said.
Brent crude for February delivery rose over $1 early in the session before paring gains to seesaw near $107, flat on the day. The volatility followed the benchmark's biggest weekly fall in six months after the restart of the El Sharara oilfield following a two-month blockade by protesters.