Noises while pedaling

While pedaling on some gears, I was hearing rythmic noises. On my ride last Saturday, the noises got louder and occurred on all gears.

Hence, on my way home along Commonwealth Avenue in Fairview, I passed by the local bike store and had my bike diagnosed and fixed.

The culprit - the bottom bracket had loosened. When it was tightened, the noises were gone.