LYNN – After nearly a week of investigating a Lynn family’s accusations of bullying at the Brickett Elementary School, Lynn Police say they still have not found any evidence that would suggest Mathew Mumbauer’s injuries happened while he was at school.Police Chief John Suslak spoke with Superintendent Nicholas Kostan Thursday, and informed him that detectives have been unable to find any evidence of the attack on Mumbauer.”I spoke with the police today, and they told me they still can’t find any evidence of a fall or push that have caused injury to this student on March 10,” he said.While Kostan was under the impression that police had concluded the investigation, Suslak said detectives are still hoping to speak with Mumbauer, who remains paralyzed with a breathing tube, when he is healthy enough to do so. Public information Officer Lt. David Brown said Thursday that he had no knowledge of the department concluding the investigation.Suslak said that while something clearly happened to Mumbauer, the police simply cannot find evidence that it happened at school.”We are not sure what happened. Not sure if there was an incident at the school but everything we have found to date can’t substantiate that anything happened at the school,” he said. “We have not been able to talk to the boy and obviously he is a big piece in all of this. At some point it will be medically appropriate to go and talk to him.”Without trying to infer any negative action on the part of the family, Suslak added that there were still many questions regarding the timeline of events leading up to Mumbauer’s hospitalization.Mumbauer has been in intensive care at Massachusetts General Hospital since March 11, one day after his parents say he was brutally attacked by a bully who pushed him down the stairs at school.Mumbauer’s injuries have left him paralyzed from the chest down and breathing on a ventilator, although MGH officials have recently upgraded the boy’s condition to “fair.”School officials say that Mumbauer had complained of a leg injury that day at the school, but told teachers that the incident did not happen while he was there. When he left school that evening he was reportedly picked up by both of his parents, who were informed of his condition. The next day, the family says Mumbauer was in intensive care, paralyzed.Some details of the case remain a mystery, such as why the family waited until last week to report the March 10 incident to the school, and have never filed a police report.It also remains unclear whether Mumbauer was taken directly to MGH or if he was treated and cleared at North Shore Children’s Hospital, and what exactly took place between the time he was picked up from school and the time he entered the hospital.Mumbauer’s family, including his mother Alyssa Cormier, have not returned calls placed by the Item requesting more information or a timeline of the incident, and state confidentiality laws prevent Children’s Hospital from commenting on past patients.Kostan also said he believes the regular school nurse was not in school the day of the incident when Mumbauer was allegedly complaining of pain and numbness in his leg, but pointed to Brickett Principal Debra Ruggeiro for confirmation of that report.Calls placed to the Brickett School Thursday were not returned.While the investigation into the alleged incident continues, Mumbauer’s family is moving forward with a fundraiser and raffle at Saugus’ First Congregational Church, scheduled for Saturday, April 12. For a $10 donation, attendees will gain entrance to a dance, be served refreshments and have an opportunity to purchase tickets for a raffle of unspecified prizes.The church’s address, 300 Central St. in Saugus, is the only listed donation address for the Mathew Mumbauer Fund. The bank affiliated with the fundraiser is not known at this time.While Mumbauer’s family has suggested that they will sue the school department, city lawyers say they have not received an official complain