Human Rights Watch warned on Wednesday that Syrians fleeing Israel's onslaught on Lebanon could face repression at home as more than 355,000 Syrians returned in more than a month of war.
"Syrians escaping Lebanon, particularly men, risk arbitrary detention and abuse by Syrian authorities," the group said in a statement.
"The deaths in custody of deportees under suspicious circumstances highlight the blatant risk of arbitrary detention, abuse and persecution for those fleeing back," said HRW's deputy Middle East director, Adam Coogle.
Since Israel launched its intensive air campaign on September 23, more than half-a-million people have fled from Lebanon to Syria, including more than 355,010 Syrians, according to Lebanese official figures.
HRW said it had documented five arrests in October.
It cited the case of a fleeing woman whose husband was "immediately" arrested by Syrian military intelligence, although they had hoped a recent amnesty, which included army deserters, would protect him.
"Syria is no safer for return than it was before, but the escalating dangers in Lebanon have left many Syrians with nowhere else to go," Coogle said.
"Their return is not a sign of improved conditions in Syria, but of the stark reality that they're being shut out of safer alternatives and forced back into a country where they still face the risks of detention, abuse and death."
Last week, Transport Minister Ali Hamieh told AFP Israeli bombing had made a second border crossing between Lebanon and Syria inoperable — leaving only one official crossing between the neighbouring countries operational.
After nearly a year of cross-border fire with Hezbollah, Israel last month ramped up strikes on the group's strongholds and then sent ground forces across the border.
You may also like
UAE sends fifth aid ship to Gaza Strip in Operation Chivalrous Knight 3
Royal Mail Christmas posting dates revealed - giving people weeks to send cards and gifts
UAE Police announce security exercise in Umm Al Quwain, RAK; no photos allowed
Prince Harry and Meghan Markle told 'not a hope in hell' of UK return
Melinda French Gates has a new boyfriend? Who is Philip Vaughn?