Activists of the Raj Thackeray-led Maharashtra Navnirman Sena on Sunday attacked 13 railway board examination centres in suburban Mumbai protesting "inadequate representation" to locals and chased away candidates from north India.

About 10 MNS activists have been arrested from central suburban Dombivali and Kalyan so far for disrupting the exam and preventing candidates from appearing the examination, the police said.

"We have arrested 10 MNS activists so far from Dombivali and Kalyan under the charges of rioting at the examination centres," Thane Commissioner of Police Anil Dhere told PTI.

When asked about the candidates being attacked at Thane station in the wee hours, Dhere denied the reports.

Railway officials confirmed that there was no such incident at Thane station, he said.

Confirming the attack by MNS activists on the examination centres in Mumbai, Central Railway PRO S Sharma said, "We have reports of 13 centres mostly in Dombivali and Navi Mumbai been attacked."

"Attackers even tried to tear exam papers and hall tickets of some of the candidates at Nerul in Navi Mumbai," Sharma said.

Despite the disruption, the exam was conducted at total 82 centres in Mumbai with the help of local police, he added.