A man was arrested on suspicion of producing cannabis by police investigating a house fire.
Firefighters tackled the blaze in the roof of a terraced house on Millfield Road, in Horbury Junction on Tuesday.
Chris Redfern, 26, was working nearby at DX Products when he spotted smoke, coming from the middle terrace, in a row of three, at about 11am.
Mr Redfern, of Princes Gate, Horbury, believes it was someone in his office that raised the alarm and called firefighters.
He said he and Josh Tomlinson jumped straight up and out to the houses to check there was no one inside.
He said: “We were in our office and noticed lots of smoke coming from the middle house.
“Me and my colleague Josh were braying on doors and windows trying to get into the houses.
“There were cars there so we were worried. We just wanted to make sure nobody was in.
“The whole estate was really smokey. The smoke was billowing.”
Mr Redfern said they were about to try to get inside the houses to make sure there was no one inside any of the homes when firefighters arrived at the scene.
Fire Crews from Ossett and Dewsbury, plus an aerial rescue pump from Wakefield, all attended.
And police were called to the scene at around 11.40am.
When officers searched the property, they found evidence of suspected cannabis production.
A 25-year-old man arrested on suspicion of producing cannabis and causing criminal damage has been released on bail.
No one was injured in the blaze but the roof of the property was damaged.
The cause of the fire is under investigation.