Police are investigating a series of Snapchat photos that appear to show a four-year-old Tennessee boy with a marijuana joint in his mouth.

The photos of the child were posted this week to the Snapchat account of KaPorsha Cross, a Memphis resident and mother of four young children.

In one photo, Cross’s son can be seen with a joint in his mouth, while another image shows the child holding the joint. In both photos, the boy’s older sister is by his side.

The Snapchat photos, broadcast last night by WMC, have triggered a police probe. A Memphis Police Department spokesperson told TSG that detectives with the department’s crimes against children unit have opened an investigation.

Cross (seen at left) did not respond to a Facebook message seeking comment about the images of her son, who turned four this month.

While Cross’s Facebook page is filled with photos of her smiling brood, cops will likely take note of a July 4 post captioned “My toddlers.” A video uploaded that afternoon shows the boy holding a match and lighting a handful of firecrackers. The child held on to the lit firecrackers so long that they nearly exploded in his hand.

In a July 3 post, Cross asked her Facebook friends to follow her new Snapchat account (@mzp_andnem).