A Vietnamese government source tells CNN that they have been contacted by a father who fears his daughter is among the dead in the Essex truck incident.

Separately, a Vietnamese government-run newspaper reports that another father has also come forward asking for help in finding his son who went to the UK in the last few days.

The government source told CNN that that a man named Pham Van Thin sent an emergency letter to local authorities in Ha Tinh province, reporting that his daughter Pham Thi Tra My was missing in the UK. The father suspects, the source said, she may be one of 39 victims in the tragedy.

His daughter departed for China on Oct. 3, before heading on to France and the UK, according to the source. Relatives also reported that Tra My sent text messages pleading for help. The government source tells CNN that local authorities in Vietnam have been asked to check into the man’s claims.

Earlier on Friday, Deputy Chief Constable from Essex Police Pippa Mills said the police "will not be commenting on any speculation about the nationalities of those who have tragically lost their lives."

“I strongly urge journalists and people on social media not to speculate about the identities of those involved or the circumstances surrounding this investigation," Mills added.