Burning smell/smoke from engine compartment

Hello Friends,

I need your help in figuring out what caused smoke/burning from engine compartment. I was driving home last night, and could smell something burning, like rubber. Then I could see smoke coming out of the left side of the hood. Luckily, I was only a couple blocks from my house. Initially, I thought it was the tire, but they looked fine.

I went out this morning to see what may have cause this. The only think I could notice was the base of the radiator was black and wet, but it was not greasy, it connects with a hose, which got dirty as well.

I took a couple of pictures of the area where the smell came from. Not sure what I am looking at. These were taken from the driver side, under the hood near the radiator.

Any insight would be greatly appreciated. thank you in advance.