A man has been held on suspicion of attempted murder after the attack in Edgbaston, Birmingham, on Monday.

The West Midlands and Metropolitan forces are looking into whether there is a link to a similar attack in Ealing, west London last month.

The Birmingham victim, in his 70s, was approached, sprayed with a substance and had his jacket set on fire.

Neighbours told the BBC they helped to put the flames out and carry the victim to his home where he was treated by paramedics.

His son said his father was "very badly burned" and they were praying for his recovery.

He was taken to hospital with burns to his face which are serious but not thought to be life-threatening. Police said he remained in a stable condition.

'Praying he's OK'

Tayyab Riaz, the victim's nephew, said everyone was "very upset" at the "shocking news".

"For 35 years he's been going to that mosque to pray and there's never been a problem," he said.

"Suddenly this happens. His hair, beard and eyebrows are badly burnt. We're praying he's OK."

A video of an attack shared on social media which shows a man being set alight is under investigation by police.

Downing Street described the incident as a "concerning case".

The suspect was arrested in Dudley Road, the street where the Birmingham mosque is, on Tuesday after being identified by officers carrying out inquiries. The attack happened just after 19:00 GMT in nearby Shenstone Road.

Members of the mosque told Channel 4 news they had spotted a man in the congregation on Monday who stood out because "he wasn't praying and was sitting in the wrong direction".

Sahir Aziz Adam said he approached him and said the traditional Arabic greeting to him - "as-salamu alaykum", which means peace be upon you, but the man didn't respond, which set alarm bells ringing.

He left the building and Mr Adam said he called the police.

In Ealing, an 82-year-old man was set on fire as he left the West London Islamic Centre on Singapore Road, at about 20:00 on 27 February.

Ch Supt Richard North, commander at Birmingham police, said: "We are aware of the incident that happened in London.

"We are actively working with the Metropolitan Police to see if those two incidents are connected. That's a major part of our inquiry.

"I have had meetings today with colleagues from the Metropolitan Police and they are engaged in the inquiry. We are working very much closely together."

He said officers had been "working through the night to establish what happened and who is responsible".

"We are taking this matter extremely seriously and are using all resources available to us," he said.

"We are keeping an open mind to the motive of the attacker and we won't speculate further at this stage."

He added: "Our investigation continues with support from Counter Terrorism Policing West Midlands who have access to specialist capabilities to help establish the full circumstances surrounding the incident."

Monsur Alam said the attack was "very scary"

Officers are aware of a video posted on social media "showing a man being set alight, and we're examining it as part of our investigations", the force said.

Father of four Monsur Alam, aged 60, has lived in the road where the attack happened for the past five years.

"I heard screaming and my daughter was screaming as well," he said. "My wife ran outside with a bucket of water and a man poured over him (the victim)."

"It was very scary," he added.

Mohammed Abbasim, from Dudley Road Mosque, said: "It's shocking to see that someone that you know has been targeted in this way."

"When things like this happen, it's an opportunity for the local people to come together rather than divide further," he said.

Scorch marks are on the pavement in Edgbaston where the attack happened

Residents said a lot of doorbell footage in the area had been handed in to police.

Extra officers will be in the area to speak to the community and provide reassurance.

In a joint statement, the city council's leader Ian Ward, cabinet member for community safety John Cotton and ward councillors Sharon Thompson and Marcus Bernasconi called it a "horrific attack".

They also said they would be talking with community groups and local mosques "to offer support to the wider community".

"We would urge the community to work with the police and to avoid any speculation at this stage," they added.