The national executive of the Shiv Sena passed a resolution authorizing Maharashtra Chief Minister and party chief Uddhav Thackeray to take action against the rebels.
The executive also passed a resolution that no other political outfit can use the name Shiv Sena and the name of its founder, late Bal Thackeray.
The Mumbai police have deployed its personnel at the city-based offices of various political parties and leaders, including ministers, MLAs and MPs, and their residences as a security measure, an official told PTI.
The prohibitory orders issued by the city police under CrPC section 144 in the first week of June, ahead of the Rajya Sabha elections, will continue to remain in place till July 10. It bans the assembly of five or more persons at one place.
The national executive meeting of the Shiv Sena is underway at the party's headquarters in the city, where Maharashtra Chief Minister Uddhav Thackeray, who is also the party president, is expected to take a decision on the action against the rebel MLAs, including Eknath Shinde.
Thackeray was supposed to chair the meeting virtually from his residence 'Matoshree'. However, he reached the party headquarters - Shiv Sena Bhavan - at Dadar in central Mumbai.
Union Minister Ramdas Athawale said the MVA government in Maharashtra no longer enjoyed majority in the legislature as over two-third MLAs of the Shiv Sena were with rebel leader Eknath Shinde.
"Shiv Sena rebel Eknath Shinde has support of more than two-third MLAs, thus reducing the MVA government to a minority. Fadnavis told me the BJP has no role to play in this development. The BJP has neither initiated this rebellion nor supported it, he told me. The BJP will wait and watch," the Union minister of state of social justice and empowerment said.