June 7, 2013 -- Authorities expected to file manslaughter charges against the man who was operating the crane at a Philadelphia building collapse that killed six people on Wednesday, officials said.
Marijuana was found in the system of the crane operator, Sean Benschop, 42, after the collapse, according to police sources.
The operator also admitted to taking codeine and other prescription drugs before the accident, and he was outfitted with a soft cast up to his elbow while working the heavy machinery, police sources told ABC News station WPVI. A source later confirmed the details to ABC News.
Mayor Michael Nutter's office had said Benschop was charged with six counts of involuntary manslaughter and one of reckless endangerment, but the Philadelphia District Attorney's Office later said that was mistaken.
"No one has been charged with anything in this case," said Tasha Jamerson, a spokeswoman for the Philadelphia D.A.'s office.
Benschop declined to answer questions when a reporter with the Philadelphia Inquirer contacted him by cell phone today.
Citing court records, The Inquirer reported Benschop has been arrested 10 times for a range of offenses, including drug charges, theft, firearms and assault.
In addition to those killed, 14 more were injured when the vacant building collapsed on a Salvation Army Thrift Store Wednesday morning.
Rescue workers used buckets and their bare hands to move bricks and rubble to free a 61-year-old woman late Wednesday night, but that was the sole piece of good news to come from the pile of rubble where a four-story building used to stand in Philadelphia's Center City.
The 30-hour search-and-rescue operation for additional victims ended Thursday. At that time, Mayor Michael Nutter told ABC News that officials were confident there were no more people buried.
Those killed were identified as Kimberly Finnegan, Borbor Davis, Anne Bryan, Juanita Harmin, Mary Simpson and Roseline Conteh.
The building was being torn down as part of a community redevelopment project. The thrift store was open throughout the demolition.
Two of those killed were Salvation Army employees.
"We are deeply saddened by the tragic loss of life of the six individuals who perished in the wake of yesterday's building collapse," the organization said in a statement. "The passing of these individuals, including two of our employees, will be felt across our entire organization and throughout the community."
Philadelphia officials were facing tough questions over whether the accident could have been prevented.
Nutter and the city's commissioner of licenses and inspections, Carlton Williams, have conceded that complaints about the working conditions at the demolition site were not followed up on.
City officials said that a routine inspection had found no violations at the property before demolition began. Williams said that inspectors had visited an adjoining property in May after complaints were lodged, but they found no violations and did not return to the Market Street site before Wednesday.
"No subsequent inspection occurred to indicate there was any unsafe conditions," Williams said. "We did not follow up and we are definitely looking into that."
Nutter promised a "wide-ranging investigation" into how and why the building collapsed.
In the wake of the collapse, Nutter has announced that every active demolition site in Philadelphia was being inspected for safety. He also announced a series of new rules for demolishing buildings within his city, including requiring a prohibition on using demolition machinery on a building if it is next to an occupied structure and mandatory drug tests and background checks for those operating heavy equipment on demolition sites.
At least 20 people were caught in falling debris when the building collapsed Wednesday around 10:45 a.m. An outer wall of the building that was being demolished fell outward and onto the two-story thrift store, according to city officials.
Eyewitness Dan Gillis was just working across the street when the building collapsed.
"They've been working over there for about a week now," Gillis told ABC News affiliate WPVI-TV. "It was a 30-foot wall. They started pulling on a piece of steel and I seen the whole wall just waving back and forth, and as soon as they pulled that out, there was no stopping it."
Roofer Patrick Glynn said he had been watching workers take down the building over the past few weeks and he suspected a collapse was inevitable because of the way they were going about it.
"For weeks, they've been standing on the edge, knocking bricks off," he told The Associated Press. "You could just see it was ready to go at any time. I knew it was going to happen."
A 10-block stretch of Market Street, which runs through the city, was shut down for the rescue effort.
Williams said that the building's owners and the contractors had all their permits and paperwork in order and up to date, and the building had no prior code violations.
ABC News' Colleen Curry contributed to this report.