DALLAS (AP) - Boeing is putting off more test flights of its new 787 passenger jet while it investigates an emergency landing of one of the planes on Tuesday.

Boeing shares have fallen almost 3 percent in Wednesday trading.

On Tuesday, a Boeing 787 on a test flight over the western United States had to make an emergency landing in Texas after the crew reported smoke in the rear cabin of the plane.

Boeing spokeswoman Loretta Gunter says the company will stick to ground tests until it can pinpoint the cause of the incident.

The shares dropped $1.85, or 2.7 percent, to $67.40. In percentage terms, it was the worst performer in the Dow Jones industrial average.