NCP president Sharad Pawar on Sunday said the allegations leveled by former Mumbai Police chief Param Bir Singh against Maharashtra Home Minister Anil Dehsmukh are serious and require an in-depth probe. The NCP chief said he has spoken to Thackeray regarding Singh’s letter. “I would suggest to Uddhav Thackeray to seek former IPS officer Julio Ribeiro’s help for looking into the claims made by Param Bir Singh,” he added. NCP supremo said there is no impact on the MVA government because of Singh’s allegations. Efforts are on to destabilise the Shiv Sena-NCP-Congress government in Maharashtra but they will prove futile, he added.