In the latest update in the search for three missing children is that they were last seen in South Texas.

The National Center for Missing and Exploited Children reports that amber alerts have been issued for 2-year-old Maryah Matthew, 5-year-old Dylan McGrath and 7-year-old Maddision McGrath, all of Waterbury. The children were reportedly last seen in Sealy, TX, which is about an hour drive from Houston, and police believe they could be in danger. 

According to the Waterbury Police Department, 29-year-old Crystal McGrath violated the conditions of her supervised visits when she left the McDonald's restaurant located at 530 Reidville Drive in Waterbury, CT with the three children.

Police say they believe McGrath is driving either a maroon 2002 Volvo S-60 with CT license plates 417-YTY.

Crystal McGrath is described as having blonde hair and blue eyes, and stands at 5'4'' , weighing 150 lbs. She was last seen wearing a black shirt and black pants/tights and authorities say she may be in the company of her boyfriend, 38-year-old Lester Joy, who is a registered sex offender, according to WFSB. Lester Joy is described as having black hair, brown eyes, and stands at 5'5'', weighing 160 lbs.

If you or anyone you know has any information about the whereabouts of these people, please contact the Waterbury Police Department Detective Bureau 203-574-6941 or 911 immediately.

Here is a photo gallery for a closer look at all of the parties who police say are involved: