Wall Street rallied Thursday, finding momentum toward the end of a volatile session, as the lowest oil prices in more than a year gave investors a reason to scoop up shares battered in the recent market selloff.

The Dow Jones industrial average (INDU) surged 401 points, after having fallen as much as 380 points in the late morning.

The Standard & Poor’s 500 (SPX) index rose 4.3% and the Nasdaq composite (COMP) gained 5.5%. The gauges were on both sides of the breakeven point throughout the morning.

After the close, Google (GOOG, Fortune 500) reported higher-than-expected third-quarter earnings on revenue that was in line with forecasts. The search engine’s shares rose 12% in after-hours trading.