Slamming Maharashtra Chief Minister Uddhav Thackeray over the loudspeakers-on-mosques issue, MNS president Raj Thackeray on Tuesday cautioned the Shiv Sena-led MVA government against "testing the patience" of his party in the matter.

In a letter addressed to the chief minister, Raj, who perhaps for the first time addressed his estranged cousin as "Uddhav Thackeray", said over 28,000 MNS workers have been served preventive notices, while thousands have been externed.