Missing 12-year-old boy, Alex Thompson, last seen near the river park in the Kennewick-Pasco-Richland area, Washington.

My son, Alex Thompson, age 12, has been missing since yesterday afternoon. We last saw him in our neighborhood around the Kennewick-Pasco-Richland area, approximately near the river park. He is about 5'5" tall, has brown hair, and was wearing a blue jacket and black jeans. He usually goes to the park to play with his friends, but he hasn't returned home. We're extremely worried about him, and any information would be appreciated.