Pictured: Shiite leader Rasoul Al-Musawi, who was shot outside an Islamic prayer centre by people claiming to be supporters of the Islamic State

Fear of revenge attacks follow the shooting of a Shiite Muslim in a drive-by attack in Sydney's south-west.

Rasoul Al-Musawi was closing up an Islamic prayer centre on Rosedale Avenue is Greenacre when the attack occurred, with friends claiming he was targeted targeted by people claiming to be supporters of Islamic State.

Mr Al-Musawi was shot in the face and shoulder while he was with his wife and four of his children at the Husainiyah Nabi Akram centre.

Mr Al-Musawi's friend - who did not wish to be named - is a Shiite Muslim and said the shooting in Greenacre was motivated by the sectarian struggle in the Middle East.

'They called us "Shia dogs" and they threatened to come back down tonight and kill you, shoot you, whatever,' he told ABC Radio on Monday.

The man said they had taken no notice of the threats made on the night of the shooting - which also included 'IS lives forever' - but then he received a phone call saying his friend had been shot.

'He was walking his family home so he can come back and do the cleaning [at the Islamic Centre] and they shot him in front of his family,' he said.

'His wife, she just fainted.'

Mr Al-Musawi's daughter said he was shot from behind and she and her father were leaving the Islamic prayer centre.

'We heard two loud bangs. My dad just held his neck and ran inside,' she told Network Ten.

'All I see was blood running down his head and neck.'

He is now in a stable condition after undergoing surgery, and police described his wounds as 'not life threatening'.

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Police are investigating a drive-by shooting where the phrases 'ISIS lives forever' were heard being shouted hours before a man was shot

The 47-year-old man was a Shiite Muslim leader at the Islamic prayer centre in Sydney's south-west

Mr Al-Musawi's daughter said he was shot from behind and she and her father were leaving the Islamic prayer centre

ISIS (Islamic State in Iraq and Syria) refers to terror group Islamic State who are based in Syria and Iraq.

The extremist militants see Shiite Muslims as a threat to their end goal of establishing a caliphate in the Middle East because the sect makes up most of the Iraqi Government who are opposed to the Sunni-dominated regime.

A police spokeswoman told Daily Mail Australia they were not disclosing which hospital he had been taken to due to his personal safety.

'As a precautionary measure, we're not giving that out,' she said.

Well-known member of the Shiite community Jamal Daoud said this was not the first time worshippers had been targeted while they were trying to pay their respects during Ashura - a 10-day tradition which marks Imam Hussain's death. Imam Hussain was the grandson of Prophet Muhammed.

Mr Daoud told The Sydney Morning Herald the centre had experienced a few attacks in recent days.

On Friday about 8pm, a security officer employed by the centre was attacked by three men who hit him in the face, Mr Daoud said.

On Monday, members of the Shiite Muslim prayer centre congregate outside as police visit

Detectives leave the centre on Monday after speaking with members of the Rosedale Avenue place of worship

Police are yet to discover if the shooting and the threats made from a car were related

He said the 'extremists' were deliberately trying to threaten the Shiite community and the people he had talked to were 'very concerned' and 'very scared'.

'This is very dangerous. It's a warning something bigger could happen.'

In a statement, NSW Police said they would like to hear from anyone who may have seen a vehicle driving in the vicinity of the location at the time of the shooting.

Investigators are still yet to see if the two incidents are connected.

Members of the centre took care of the man's injuries until paramedics arrived after taking him off the street and back inside the building he had just exited, 9News reported.

Well-known member of the Shiite community Jamal Daoud said this was not the first time worshippers had been targeted while they were trying to pay their respects during Ashura

On Friday about 8pm, a security officer employed by the centre was attacked by three men who hit him in the face, Mr Daoud said

Witnesses heard threats being shouted from a car just hours before the shooting, which included 'ISIS will live forever'. ISIS refers to terror group Islamic State (pictured)

The man sustained injuries from pellets which were fired off. He is in a stable condition in an unknown hospital

The centre was opened 10 years ago in an industrial area of Greenacre - which has been closed off by investigators - where there are many smash repairs and wrecking yards.

Firearm detection dogs were seen searching the centre and the areas around it.

Officers investigating the shooting are asking those who had not already spoken to police to contact them.

They are still trying to figure out why the attack had been carried out.

'At this point in time it does not appear that there is any type of motivation for the shooting,' Inspector Dave Firth said.

'We are following several lines of inquiry.'

Those who work in the area said the neighbourhood was normally 'quiet'.