There are certain mistakes that are not typos or oversights. The usage of violent mob is one. [I had an earlier take on this about angry mobs.] A mob is always violent; there are no peaceful mobs. When the adjective that one is using to qualify a noun is embedded in the latter itself, the use of the adjective is redundant. You don't really talk of cold icecreams, do you? Usage of violent or angry mob is as stupid as that. I found this in a CNN-IBN story (3 get life term for anti-Sikh riots; March 29, 2007):
Kaur's husband Niranjan Singh, a head constable with the Delhi Police, who was on duty at Shahdara Railway Station on November 1, 1984, was lynched and set ablaze by a violent mob led by the accused.
I had seen, more or less, the same mistake in the Times of India (1984 riots: 3 convicted for lynching family; March 26, 2007) a few days back:
According to the prosecution, Kaur's husband Niranjan Singh, a head constable with the Delhi Police, who was on duty at Shahdara Railway Station on November 1, 1984, was lynched and set ablaze by a violent mob led by the accused.
The original mistake was in a Press Trust of India (PTI) creed. TOI attributed the story to the agency, but did not correct the mistake. CNN-IBN did not do either. The Times of India had something about an angry mob too (Angry mob attacks RTC bus over motorist's death; March 26, 2007) the same day:
An RTC bus was partially damaged by an angry mob late on Saturday night after the bus mowed down a motorist. They alleged that the bus was driven in a rash and negligent manner.
The Financial Express does not get to carry too many stories about mobs. With Nandigram, of course, that was unavoidable. So a March 29, 2007 story (Bengal police under fire for ignoring 'normal remedies') had this:
Chief minister Buddhadeb Bhattacharjee's effort to 'reclaim' Nandigram ended in mayhem on Wednesday, with police firing that led to 14 villagers being killed when a violent mob prevented them from entering the area that had been cut-off since January, following the administration's move to acquire land for a special economic zone (SEZ).