Some injuries reported. On my phone and can't post links. It was an ATR 72.

BBC News - Taiwan TransAsia plane crash-lands in Taipei river

Saw that there are photos online as it crashed. It passed over a road in a severe left turn. Left wing appears to have struck the road and possibly a vehicle.
The is an obvious speed difference with the propellers. The left is spinning slower.
They looks like stills from a dash-cam. Trying to find the photos on a news site.

Dashcam images of crash sequence from twitter.

https://twitter.com/W7VOA/status/562826878625808387

Survivors reported FWIW.

Video of the wreckage from the bridge. Pretty amazing people survived.

BBC News - Taiwan TransAsia plane crash-lands in Taipei river

Did it look like to anyone that the right engine was feathered in that twitter feed?

And once again we see the irresponsibility of even the major news networks allowing untrained "journalists" to comment, codify and speculate. Accidentally clicked a Googled link to a CNN segment where upon the talking head says "the pilot tried to 'tip' the plane".

It seems no matter how many times we point out a need for more responsible reporting, there's always a Richard Quest wanna be in the pipeline with little to no editorial supervision.

I'd say the left but it's hard to tell from one video screen grab. Looks like a classic VMC issue. Can anyone say if the ATRs have auto feather or auto coarse?

Been a while and I had to confirm it in my old manuals, but the 212's gave you additional power (uptrim) and autofeather. Someone fresher on the plane or with a better memory might be able to elaborate. That was probably a newer ATR so it likely had all the bells and whistles.

Based on the nose attitude and the result, looks a lot like a Vmc rollover to me.

In the sequence photos, I can't see if it is feathered, but the left engine is definitely having an issue. Props spinning at the same rpm in a photo do not look different. These DO look different.

Looks like they got slow and vmc rolled.