Speaking to reporters in Tehran, the Iranian official called on the country’s Foreign Ministry and diplomatic channels to follow up on the case in a bid to prevent terrorist attacks on the law enforcement forces.

His comments came after the death of four Iranian police officers in attacks by terrorist groups in the southeastern town of Saravan, near the border with Pakistan.

A car bomb attack on a police station in the border city left one police officer dead and three others injured on Thursday morning. The attack came a day after three other police forces were killed in a separate terrorist attack in the city.

In February 2013, Iran and Pakistan signed a security agreement which requires both sides to take strict measures to combat terrorism as well as human and drug trafficking.

But the Pakistani side has frequently failed to fulfil its obligations under the agreement.

In February this year, five Iranian border guards were kidnapped by a terrorist group in Jakigour region in Iran’s Sistan and Balouchestan province and were taken to Pakistan.

Later on April 6 and following special diplomatic efforts by the Iranian officials, four of the five abductees were released and returned home after being held hostage for two months. The fate of the fifth soldier is still unknown.