The investigation into last Saturday's accident in which NASCAR driver Tony Stewart struck and killed Kevin Ward Jr. during a sprint car race at Canandaigua Motorsports Park is expected to continue for at least two more weeks, possibly more.

Ontario County (N.Y.) Sheriff Philip Povero said on Tuesday the investigation into the death of Ward is ongoing and expects it to proceed for at least another couple of weeks. Povero noted that investigators continue to seek witnesses, gather evidence and reconstruct the crash.

The incident between Stewart and Ward occurred when both drivers made contact while battling for position, with Ward spinning out and hitting the wall.

A video showed Ward climbing out of his car and then walking down the dirt track during the caution. He was pointing his finger in the direction of Stewart and apparently yelling at him to express his displeasure.

Stewart's car and the vehicle of another competitor traveling in tandem approached Ward. The first car swerved to avoid hitting him, but the right rear of Stewart's vehicle struck Ward and dragged him briefly across the track.

Povero did not provide any details of the investigation during his briefing on Tuesday.