( CNN ) -- A bullet thought to have been from a shootout between carjackers and municipal police in Ciudad Juarez , Mexico , struck a woman walking in neighboring El Paso , Texas , Tuesday morning , El Paso 's mayor told CNN . The still unidentified woman , 48 , was shot in the lower leg ; her injuries were not considered life-threatening . El Paso Mayor John Cook said local police investigating the incident had not officially confirmed that the bullet came from Juarez , but they were `` treating it as if it did , '' he said . `` It 's still matter of speculation , '' he added . `` Early on , it became evident this may have been a stray bullet rather than a targeted shooting in downtown , '' local police said in a press release . `` The El Paso Police Department continues its investigation and is working closely with its counterparts in Mexico . '' If the bullet did in fact come from Mexico , this is `` the first time a person has been hit '' in the 3Â½ year since drug-fueled violence escalated in neighboring Juarez , Cook added . In Juarez , a shootout between suspected carjackers and the municipal police happened around 11 a.m. ( 1 p.m . ET ) , about the same time the woman was shot , according to municipal police spokesman Adrian Sanchez . He was unaware of any connection between that shooting and the incident in El Paso . `` We have an office that works with the U.S. and so far we have not received a report from them saying the two incidents were connected , '' he added . El Paso police said that while they were responding to the shooting , the El Paso 911 center `` received numerous calls advising of shots fired near the border in Juarez , Mexico . '' Just about a mile separates downtown El Paso from Juarez . `` Under the right circumstances there is a possibility that a round fired from an AK-type weapon could travel that far , conceivably , '' Mike Brooks , HLN Law Enforcement analyst told CNN . `` It depends on what kind of round it is and how heavy the round is . '' `` We 're advising the citizens of El Paso that this is an isolated incident . We do n't want people to start panicking , '' he said . At least four schools in El Paso went on lockdown shortly after the woman was reported being shot . `` We were alerted by local police about concerns in the area , '' Estela Reyes , the press officer for the La Fe Preparatory School , told CNN . `` We were in lockdown by 11:30 a.m. and lifted it about 30 minutes later . The kids were never in any imminent danger , '' she said . Reyes said her school is about `` seven or eight blocks '' from downtown El Paso and she never heard gunfire from Juarez . In June 2010 , the El Paso City Hall was struck by several rounds , which local police believe the shots may have come from a shooting in Juarez . About two months later , a similar incident occurred when a building at the University of Texas at El Paso was struck by a bullet . School officials believe that round also came from a shooting in Juarez .
A woman in downtown El Paso was hit in the leg by a bullet Tuesday . El Paso police are treating the incident as if the bullet came from Juarez . It occurred at about the same time as a shootout between Juarez police and carjackers . At least four schools in El Paso went into lockdown after reports of the shooting .