MNS workers have blocked the Mumbai-Pune Expressway at Vashi, in suburban Mumbai. 

Tension brewed in parts of Mumbai and adjoining Thane districts today following yesterday's incident of stone pelting on Raj Thackeray's convoy by alleged NCP workers in Ahmednagar district, with MNS supporters attacking NCP office in Ambernath and calling a bandh.

Angry MNS workers burnt effigies of Deputy Chief Minister Ajit Pawar and blackened his posters in some parts of the city.

Incidents of stone throwing were also reported from city suburbs including Chembur, Kurla and Bandra, police said. In Thane's Ambernath, MNS workers attacked NCP office and tried to enforce a bandh today.

NCP activists were furious at Thackeray's criticism of Pawar, nephew of party supremo Sharad Pawar, whom the MNS leader blamed for the severe drought in several parts of the state.

Thackeray had at a public meeting in Solapur recently attacked Pawar, who headed the water resources ministry between 1999 and 2009, for allegedly having failed to check water scarcity despite huge spendings on irrigation projects.

There have been allegations of a Rs 70,000 crore scam in the irrigation department, which has been with NCP since inception of Congress-NCP government in Maharashtra in 1999.

Meanwhile, MNS MLA Ram Kadam issued an open threat to NCP leaders and workers if they continued to target Thackeray. "We know how to give tit for tat. We believe in replying in the language people choose to speak to us. They (NCP leaders) have forgotten that they have to move in Maharashtra.... Their homes are in Mumbai," he said while speaking to a TV news channel.