car alarm was going off so

my vehicle alarm was going off not sure why. I took the key out to open the vehicle from the key fob.

I tried first to shut it off (by the alarm button) but it only blink .And the alarm kept going on

got into the vehicle, two signal lights came on now (blinking) .Both the alarm and signal lights going off.

my key is still in my hands . Everything finally shutting off once I put the key in and put it in drive as I had my foot on the brake

any ideas? thank you