The leader of al-Qaeda has called for attacks on Saudi Arabia, following the mass execution of 47 people in the Kingdom – many of whom were tied to the extremist group.

Al-Zawahiri, the group's leader, announced the threats in a seven-minute audio recording earlier this week, which was reported by a US terror monitor, the SITE Intelligence Group said on Thursday.

In the recording the Egyptian militant leader urged his followers to launch new attacks against the kingdom’s ruling Al Saud family, which he called a “rotten regime that corrupted your religion”.

Saudi Shiite men hold placards bearing portraits of prominent Shiite Muslim cleric Nimr al-Nimr during a protest against his execution by Saudi authorities Getty (STR/AFP/Getty Images)

Al-Zawahiri also called for attacks on “the Zionist-Crusader alliance”, referring to Israel and its Western allies, as “what hurts Al Saud so much”.

The majority of those killed in the mass executions on 2 January were Sunnis convicted of involvement in the deadly 2003 and 2004 al-Qaeda attacks that killed Saudis and foreigners.

Saudi Arabia's ministry statement said the 47 had been convicted of adopting the radical “takfiri” ideology, joining “terrorist organisations” and implementing various “criminal plots”.

Since the al-Qaeda attacks, over a decade ago, the group have been eclipsed by Isis, a breakaway fraction holding territory in Iraq and Syria.

Al-Zawahiri’s message comes amid high tensions between Sunni-ruled Saudi Arabia and Shiite power Iran over the executions, which included the killing of Shiite cleric Sheikh Nimr al-Nimr.

Pakistani Shiite Muslims march during a protest in Islamabad against the execution of prominent Shiite Muslim cleric Nimr al-Nimr by Saudi authorities Getty (FAROOQ NAEEM/AFP/Getty Images)

After al-Nimr’s death protesters in Iran attacked two of the kingdom’s diplomatic posts and the kingdom cut its diplomatic ties to the Islamic Republic.

Al-Zawahiri dismissed the killing of al-Nimr as part of the “Saudi-Iranian competition for power in the region”.

Prime Minister David Cameron was criticised for turning 'blind eye' to mass executions in Saudi Arabia after he failed to immediately comment publicly on the killings.