The father of Jeremy Forrest who left the country with schoolgirl Megan Stammers last Thursday has spoken at a press conference in Lewes.
Jim Forrest fought back tears while he sat by his wife Julie to implore their son and 15-year-old Megan to call or email home.
Directly appealing to the runaways, Mr Forrest said: "Hi Megan, hi Jeremy, I hope this message reaches you and you are both okay. There are a lot of people back home that are desperate to hear from you.
"All I am asking is for one of you to make a call, send an email, so we know you are both safe.
"We are all here for you both. Please, please get in contact."
The police say their tickets were purchased in advance and they understand that Megan went willingly.
Sussex Police Chief Inspector Jason Tingley confirmed that that an European arrest warrent has been issued for the 30-year-married teacher.
He added: "It's not too late for one of them to get in touch."