This is the 1839th most frequent Russian word.
обстрел
"Обстрел" means "shelling" or "bombardment."
Here 'обстрел' is used as a noun referring to military artillery firing.
Вчера ночью произошёл сильный обстрел на границе.
Last night there was heavy shelling at the border.
In this sentence, 'обстреливает' is derived from 'обстрел' and is used as a verb indicating the action of shelling or shooting.
Полиция обстреливает машину преступника, пытаясь его остановить.
The police are firing at the criminal's car, trying to stop him.
Here 'обстрел' refers to a specific type of attack involving artillery or bombs delivered from the air.