Story highlights Pakistan installs anti-aircraft guns and radars, an official says

The move comes in the wake of a NATO airstrike last month

"We had to do it after being deceived by our so-called friends," the official says

Pakistan, in a bid to bolster its border with Afghanistan, has installed anti-aircraft guns and radars to monitor air activity, a senior Pakistani military official told CNN.

"We had to do it after being deceived by our so-called friends," said the official, who spoke on the condition of anonymity.

The move comes in response to a NATO airstrike last month that killed 24 Pakistani soldiers.

The official declined to say how many anti-aircraft guns and radars were installed along the country's western border.

On Friday, the Pakistani government released a statement that said Prime Minister Yousuf Raza Gilani had been briefed by army chief of staff Gen. Ashfaq Parvez Kayani on national security issues.

"The Army Chief apprised the Prime Minister of the steps taken on the western borders to revamp the defense capabilities aimed at effectively countering the recurrence of the incursion into the Pakistan territory," it read.

"The Prime Minister said that the government and the people of Pakistan were ready to provide the Armed Forces all the necessary resources to bolster its defense and professional capabilities," the statement said.

The NATO airstrike strained relations between Islamabad and Washington.

The United States has insisted that the attack was not deliberate and expressed regret over the deaths of the soldiers.

But in the aftermath of the attack, the Pakistani government has shut down NATO supply routes through Pakistan, boycotted a conference on the future of Afghanistan and also asked the United States to vacate an air base on its territory.

The attack prompted widespread outrage in Pakistan; the military is conducting an investigation.