[ابو بيشو]

اليك منى كل احترام وتقدير شكرا

On hearing that the child had been found, she burst into
tears.

To show that two things happen at the same time or that one thing happens
immediately after the other, use onlupon doing sth (NOT when):
'On examining the suitcase, he noticed that the locks had been tampered

with.'