They would have to be interrogated by a board of approved rabbis and if found eligible reconverted. Along with the children if the female is the convert. If not found eleigible they would revert to a gentile status and be refused Jewish burial or Jewish marriage for their offspring. Orthodoxy in Israel and in the diaspora is becoming more and more ghettoised and eventually will become nothing more than a sect within the Jewish People, a sect living with so many stringencies that they will no longer be able to eat in their own homes.
Israeli troops shoot, injure Palestinian crossing Gaza border fence (Haaretz)
from the article: Rabbinate no longer recognizes overseas conversions