Strange Humanoid During What is Believed a Possible Burglary

This happened in 1986 in Brockton, Massachusetts
. A few things I want to put out there before I get into this.
1. The house is no longer in the family. It has been renovated since and I do not want to involve the current owners.
2. My sister (a witness) is ailing and I do not want her bothered.
3. Witness 3, my brother, has no interest in getting involved in this.
The story is this, late one night, sometime in July of 86, I, my sister, and my brother were up in mine and my sister's room jumping and playing around. I would've been 15 at the time, my brother 14, and my sister 17.
Our dog came flying up the stairs to our room barking like crazy. We followed the dog down past my parents apartment on the 2nd floor, which was the main house for us. Then down past my older brother's apartment on the first floor into the basement where we found the bulkhead door had been forced open. At this we all ran up to the first floor hall where we noticed movement on the back porch.
I pulled the back door open and to my left noticed a humanoid figure about 7ft in height with red glowing eyes, and clawed hands that went down past the knees of this creature. My sister also saw this as she was right behind me. Upon seeing this, we fled back into the house, locked the door and ran up to my parents apartment where police were called. Police did find the basement door forced open. And believe their was an attempt to break in to our house, however, they believe the perpetrators were scared away by the dog. After we explained what we saw, the police believed it may have been other individuals "messing" with us as they found nobody or no humanoid lurking in the area. Our parents were notified by police of the situation and told us to remain in my parents house with the doors locked. Of course my parents also believed the humanoid we saw was most likely a human and probably the burglar. Though I know of no people that big with red eyes and clawed hands. The humanoid was white, no clothing, and no way to decipher the sex. I only had about a 5 second look at it. As a footnote, no flying object was observed during this situation. I didn't know where I should report this so I posted here.