`Rasta roko' protests were held in Solapur and Nashik to condemn the attack on Pawar, who was slapped by a youth at a public function claiming he was angry with corruption and price rise.
Senior Nationalist Congress Party Minister Laxman Dhoble led the 'rasta roko' at Mohol in Solapur district. The protesters shouted slogans, condemning the attack.
NCP workers blocked vehicular traffic at Trimbak Road and Kalwan in Nashik district to condemn the attack on their party chief.
In adjoining Navi Mumbai, the agro produce market was closed in protest. In Baramati, Pawar's native place in Pune district, traders observed spontaneous bandh.
Political parties were quick to denounce the assault.
Maharashtra BJP President Sudhir Mungantiwar condmed the attack, describing it as cowardly. Leader of Opposition in Maharashtra Assembly Eknath Khadse said, "In a democracy, such attacks are condemnable. One can protest using non-violent means but such an attack cannot be justified."
Home Minister and NCP leader R R Patil said Pawar's security needs to be stepped up in the aftermath of the incident. 71-year-old Pawar, who went to attend a literary function at a public auditorium on Parliament Street, was slapped by Harvinder Singh, a transporter in his thirties who had also assaulted former Telecom Minister Sukhram outside Rohini Court on Saturday after he was sentenced in a corruption case.
The NCP workers also held protests at Mulund and Worli areas of Mumbai. Some party workers were taken into custody in suburban Mulund for trying to disturb law and order, said a police official.
Tight security is being maintained across Mumbai following the incident, said police.
Meanwhile, Maharashtra Chief Minister Prithviraj Chavan strongly condemned the attack on Pawar and said such incidents expose "lapses" in security of senior leaders and ministers.
"It has come to light that the same person had attacked former Union Minister Sukhram a few days ago. The fact that such people can come close to senior political leaders and ministers is a cause of concern and indicates lapses in security," Chavan said.
The Congress leader demanded a thorough probe into the incident. He said Pawar is not only a senior Union Minister but also a national leader. "He should be provided adequate security and it should be ensured that such an incident does not happen again," he said.
Home Minister Patil has demanded that Delhi Police thoroughly probe the incident and identify the "real culprits".
He also sought adequate security for his party president. Senior NCP leader and PWD Minister Chhagan Bhujbal strongly condemned the incident and said Pawar alone was not responsible for price rise. "I have requested him to enhance his security."
Minister of State for Housing Sachin Ahir said NCP workers should protest peacefully. "Nobody should take law into their hands and cause trouble to the common man."
Ahir said both Deputy Chief Minister Ajit Pawar and State NCP President Madhukar Pichad have asked party workers to exercise restrain during protests. "There should be no call for bandh," he said.
Mumbai NCP chief Narendra Varma said Pawar has told the state leadership that he was fine and asked them to ensure there is no untoward incident.