Tensions have risen between Iran and Pakistan over border killings.
Meanwhile, the Iranian government has launched an investigation into the deaths of two Iranian nationals killed at the border.
Iran's foreign ministry says two people were shot dead while crossing the border with fuel oil on Monday.
Pakistan has returned the body of only one of them. Protests have spread across the southern Iranian border province of Sistan-Baluchestan.
A video posted on social media shows protesters vandalizing the governor's office in southeastern Iran and setting a police car on fire.
However, no one could confirm its authenticity.
