A 29-year-old mother was fatally shot Tuesday in an Idaho Walmart when her 2-year-old son in the shopping cart grabbed a gun that was in her purse and shot her in an apparent accident, authorities said.

Detectives were investigating the scene and Walmart officials immediately shuttered the store in Hayden, said the Kootenai County Sheriff's Office.

The mother's name wasn't being released as authorities were notifying her family, the sheriff's office said.

At the time, the mother and son were shopping with other family members, authorities said.

"The shooting appears to be accidental," said a statement by Sheriff Ben Wolfinger and Lt. Stu Miller.

At a press conference, Miller said the mother was shopping at the back of the store in the electronics department, CNN affiliate KXLY reported.

"It appears that the victim brought several of her children here to do some shopping after the holidays," Miller told the affiliate and other reporters in the parking lot. "The child looks like to be sitting in the shopping cart with the purse while the female victim was shopping.

"This is a pretty tragic incident right now that we're dealing with," Miller said.

The shooting occurred at about 10:20 a.m.

"A very sad incident happened in our store in Hayden, Idaho that involved a female customer," said Walmart spokesperson Brooke Buchanan. "We are working closely with the local sheriff's department as they investigate what happened."

The Walmart will reopen Wednesday morning, the sheriff's office said.