An Iranian strike on Pakistan this week that drew a rapid military riposte and raised fears of greater regional turmoil was driven by Iran's efforts to reinforce its internal security rather than its ambitions for the Middle East, according to three Iranian officials, one Iranian insider and an analyst.

Both the heavily-armed neighbours, oftentimes at odds over instability on their frontier, appear to want to try to contain the strains resulting from the highest-profile cross-border intrusions in recent years, two analysts and two of the officials said.

Iran and Pakistan have carried out air attacks on each other’s territories, targeting armed groups near their 900km-long (559-mile) volatile border, which they say were meant to ensure their respective national security.

Iran’s powerful Islamic Revolutionary Guard Corps (IRGC) targeted an armed group in Panjgur town of Pakistan’s Balochistan province late on Tuesday, prompting Pakistan to bomb hideouts of armed groups in the Sistan-Baluchestan province of Iran early on Thursday.

Pakistan conducted a series of military strikes Thursday morning against insurgents operating in Iran in response to a deadly bombing in the southwestern Pakistani province of Baluchistan on Tuesday.

The Pakistan Armed Forces completed a "series of highly coordinated and specifically targeted precision military strikes" against Pakistani terrorists in Iran's Siestan-o-Baluchistan province as part of an intelligence-based operation named "Marg Bar Sarmachar," Pakistan's Ministry of Foreign Affairs announced.