My Neighbours Called The Police For Domestic Violence & Arrested My Brother. What Now?

So for context, I (17m) have a brother (23m). Me and my brother have never really gotten along growing up and we’d always have these petty little fights.

Last night, just before midnight, my brother and I had a pretty heated argument that ended in a minor physical altercation. About 10 minutes later, after things had calmed down, there was a knock at the door. Me thinking it it was my parents, swung the door open with the house looking like a literal mess (things knocked over and broken) but it turned out to be the cops. They asked if everything was okay, and I told them it was, but then they asked if they could come inside. I hesitated at first but ended up letting them in. They explained that a neighbor had heard the argument and called about a possible “domestic violence” concern.

They first asked for our ages, and then separated us to ask some questions. One of the cops first questioned whilst the other roamed around the house. He asked me what happened, what caused it, and if we physically fought. I denied it, but the cop seemed suspicious and asked if he could check for any injuries. My dumbass didn’t even realise I looked like I just fought a war, so he took some photos of the injuries. (just bleeding scratches on my arms and neck, small bruises and my torn lip)

Afterward, they questioned my brother, who wasn’t injured. One cop came back to reassure me that I could talk freely and tried to make small talk, asking about my school, what I’m studying and my hobbies. He then left the room for a while before coming back and informed me that my brother was being arrested on “domestic violence concerns”. They asked for my parents’ contact information and then left.

I’m still unsure about what happened during the questioning of my brother, it happened all so fast. The argument honestly wasn’t that bad and I didn’t know it would end up like this. What’s going to happen next?