NCP chief Sharad Pawar accompanied the party's sitting MLA Jitendra Awhad on Thursday as the latter filed nomination papers for the Kalwa-Mumbra Assembly constituency here.
Awhad is seeking a third term from the costituency.
Pawar drove with Awhad in an SUV as they headed for the local ward office in a procession.
Sitting BJP MLA from Thane City, Sanjay Kelkar, also filed his papers on Thursday.
In Nalasopara, former 'encounter specialist' police officer Pradeep Sharma, who is entering politics as a Shiv Sena candidate, filed his nomination.
In Dombivali in the district, BJP minister and sitting MLA Ravindra Chavan filed his papers.