SAN DIEGO (AP)  Border Patrol agents are firing tear gas and powerful pepper-spray weapons across the border into Mexico to repel what the agency says are an increasing number of attacks by assailants hurling stones, bottles and bricks.

The counteroffensive has drawn complaints that innocent families are being caught in the cross-fire.

Esther Arias Medina, 41, fled her shanty in Tijuana with her 3-week-old grandson last week in the midst of an attack. The boy had begun coughing, Ms. Arias said, after smoke seeped through the walls of the three-room home, which she shares with six others.

“We don’t deserve this,” she said. “The people who live here don’t throw rocks. Those are people who come from the outside. But we’re paying the price.”