EL PASO, Texas -

Border Patrol officials are investigating an incursion by Mexican federal police into the United States on Thursday morning.

U.S. Border Patrol spokesman Doug Mosier said that armed officers with Mexico's Secretaria de Seguridad Publica were involved in the incursion, which took place in El Paso, near the Border Patrol's Ysleta station.

The Mexican government, U.S. Border Patrol and Texas Parks and Wildlife Department are investigating the incident.

An ABC-7 viewer contacted the station early Thursday, saying her son, husband and friends were hunting on the Rio Grande levee on the U.S. side when men on the Mexico side fired shots, narrowly missing them. The woman said more men arrived on the Mexico side, drove into the U.S. and fired automatic weapons. She said they also stole the hunters' chairs and then drove back into Mexico.

Mosier said Border Patrol agents and Texas Parks and Wildlife officers were sent to the area immediately.

"Upon approach, our agents observed those subjects (Mexican officers) who committed the incursion return back to Mexico," Mosier said.

Mosier said that at no point of the initial investigation were there any allegations of shots being fired at subjects on the U.S. side of the border, nor is there any information to suggest that any personal items were stolen from the U.S. side of the international boundary.

"We remain in constant and direct contact with our partners in the government of Mexico as the investigation unfolds," Mosier said.