The incident occurred before 6 pm, in the 2600 block of MacArthur Road.
The police said two people were shot dead.
Witnesses at the scene said the incident was very sudden.
“As we entered the parking lot, we saw a Whitehall police car flying past the main entrance near TJ Maxx and heading for Walmart,” said Scott Dias of Upper Macungie. “In a few seconds, we saw five or six police cars appear.”
Qusai Muhasen of New Jersey said: “When I walked in, the sound I heard was like a rumbling. I thought it was car exhaust or something.”
There are currently no claims about the victims or motives.
No official news has been released yet.
Please stay tuned, because this story is still in development.