Pakistani officials say border guards have detained three Iranian security personnel after they crossed into Pakistan late Sunday while chasing two men.

The officials in the Mazah Sar area of southwestern Baluchistan Province said the Iranian guards tried to take the two Pakistani nationals back into Iran. They said both men were wounded in the incident and one later died of his injuries.

Mazah Sar is located southwest of Quetta, the capital of insurgency-hit Baluchistan province, which borders Iran and Afghanistan.

In a separate incident Sunday in the same province, militants set off a roadside bomb next to a Pakistani military convoy, killing at least three soldiers. The attack took place near Sui town, southwest of Quetta.

Baluchistan, which is also home to pro-Taliban militants, has been in the grip of a regional insurgency for years as separatist militants fight for more autonomy and greater control over natural resources.