Lakewood police have linked narcotics to the explosion of a shed Saturday night that sent four people to the hospital but are so far undecided whether anyone will be charged.

“It was narcotics related, but it is not a meth lab,” police spokesman Det. Ryan McKone, said of the blast in a shed behind a home at 1643 S. Ammons St.

All of the hospitalized people are in their 20s and suffered “varying degrees of burns,” McKone said. “From what we can tell right now they were all in the shed.”

As of 4 a.m. Sunday, he said, all remained in the hospital.

The home, a one-story, brick rental occupied by several young men, was very quiet “right up until the boom,” said Dale Ward, who lives across the street from the house.

Dale said the explosion at 8:32 p.m. shook his house.

When he went outside to see what had happened he saw flames shooting up from the shed.

Lou and Waiva Spezze, who live next to Ward, also felt their house tremble when the shed exploded. The couple’s son, Dane, “ran and got his fire extinguisher and put it out,” said Waiva Spezze.

The residents of the house are “just boys, nice quiet kids. They never caused any problem at all,” said Waiva Spezze.

No other structures were damaged in the fire, said McKone.

A man who was outside the house late Sunday morning declined to comment.

Tom McGhee: 303-954-1671, tmcghee@denverpost.com or twitter.com/dpmcghee