Nobody was crossing over into Israel. This incident took place at the Purple or Alpha line a ceasefire line established in 1967. You could say they were crossing over from Sria into Israeli occupied Syria, but you must know The Golan is not Israel, and is outside of Israel's internationally recognised borders.
Man shot dead in northern Israel town of Bi'ina, police say the murder was gang related (Haaretz)
from the article: IDF fears continued Palestinian infiltration on Syria border