A surge in the stock price and...

A surge in the stock price and trading volume of Rohr Industries of Chula Vista prompted the New York Stock Exchange on Tuesday to ask the company if it was aware of any reason for the increases.

Rohr, whose shares closed up $1.75 at $34.25 per share on volume of 668,000 shares, said in a statement Tuesday that it knew of no reason for the increased trading activity, that it “has no announcements to make and does not comment on rumors.” Rohr is a manufacturer of jet engine components used mainly in commercial airliners.