Iran, Tehran: Hossein Jaberi-Ansari, Iranian Foreign Ministry spokesman, on Friday denounced terror attack in Imam Reza Mosque in Al-Ehsa province in Saudi Arabia which left a number of worshippers killed and injured.

He added that repetition of terror attacks to mosques and Husseiniyehs in eastern Saudi Arabia indicates the worrying security situation in the region and negligence of security forces in fulfilling their responsibility in maintaining public security against terrorists’ attacks.

At least four people were killed and eighteen injured in the attacks. There was no early claim of responsibility for the attack but it resembled previous assaults by Daesh terrorist group.

Towns and cities in the Shia-dominated Eastern Province have been the site of peaceful demonstrations since February 2011. People have been voicing their protest at Riyadh’s oppressive policies against the country’s Shia minority.