Agents in the normally quiet Big Bend Sector Border Patrol apprehended more than 250 migrants during a four-day period ending Sunday night. The migrants reportedly came to the U.S. from El Salvador, Guatemala, and Honduras.

Agents assigned to the Presidio Border Patrol Station encountered multiple groups of mostly Central American migrants beginning on May 9. By Sunday night, the agents apprehended 251 migrants who illegally crossed the border in this desolate area of West Texas, according to information obtained from Big Bend Sector Border Patrol officials.

“The significant number of arrests by Presidio Station agents is evidence that the dramatic increase in illegal entries along the southern border is impacting us locally.” Big Bend Sector Chief Patrol Agent Matthew Hudak said in a written statement. “The volume of arrests challenges our ability to effectively patrol the border while our agents are consumed by caring for persons in our custody. I commend our agents for their professionalism and dedication in the face of these challenges.”

Late Thursday night, Presidio Station agents received information about a large group of migrants attempting to illegally cross the border inside the city limits of Presidio, Texas. The agents responded to the area and located a group of 56. The following morning, the agents apprehended 19 additional migrants.

On Saturday and Sunday, agents arrested 176 additional illegal immigrants, officials reported. All will be processed for violation of immigration laws.

A photograph provided by Presidio Stations shows one of the groups that appear to be family unit aliens, including very small children.

The Big Bend Sector consists of 517 miles of extremely rugged and remote territory. It stretches from Sierra Blanca, Texas, to Sanderson, Texas.

Officials reported that Big Bend Sector agents apprehended 648 migrants during the first 13 days of this month. In April, the agents apprehended 941 migrants including 656 single adults, 224 family units, and 61 unaccompanied minors, according to the April Southwest Border Migration Report.