Texas Governor Rick Perry has accused President Barack Obama of "gambling with American lives" after a bullet believed to be from a gun battle in Mexico hit a building in the US state.
"For the second time in two months, bullets from a gun battle in the escalating drug war in Juarez have struck a building in El Paso," Perry said.
Borderzine.com, a website belonging to the University of Texas in El Paso, said the incident occurred Saturday and a single bullet hit a building belonging to the university.
No injuries were reported, but Perry said the federal government's failure to reinforce the border with Mexico was endangering US lives.
"It is unconscionable that the Obama administration is gambling with American lives," the Republican governor said.
"It's time for Washington to stop the rhetoric and immediately deploy a significance force of personnel and resources to the border."
Perry noted that in June, a number of bullets believed to be from a gun battle in Ciudad Juarez hit a building in El Paso, and that a car and a building at the University of Texas-Brownsville were similarly hit a year ago.
Texas, like a number of US states on the border with Mexico, has expressed increasing concern about the drug trafficking-related violence raging next door.
The battle between drug cartels fighting over lucrative smuggling routes and Mexican government operations against the gangs have left some 28,000 people dead since December 2006.