One of three suspects believed to have opened fire in the self-checkout area of an Alabama Walmart was arrested Friday night.

Mobile police said Karmelo Derks, 18, has been charged with attempted murder, reckless endangerment and assault.

Police said two more suspects Jimaurice Pierce, 19, and Darrius Rowser, 19, were still being sought.

Police were called Tuesday night to the Walmart off Interstate 65 in Mobile. A man and a woman had been shot. Police said they believed the incident started when two groups of people saw one another near the front of the store.

One group was in the self-checkout area and the other group had just entered the store. Exactly what happened next is unclear, but police said at least one person from each group opened fire.