Two activists seized by Israeli forces in international waters while en route to deliver humanitarian aid to Gaza have been threatened with death or lengthy imprisonment, their lawyers said on Monday.
The legal centre Adalah, which represents Thiago Avila and Saif Abu Keshek, said the pair have been subjected to psychological abuse and held in solitary confinement since their capture last week.
On Tuesday, a court in the southern Israeli city of Ashkelon extended their detention until Sunday.
Abu Keshek, a Spanish-Swedish national of Palestinian origin, and Avila, a Brazilian national, were detained late on Wednesday when Israeli naval forces raided a Gaza-bound aid flotilla in international waters off Greece.
They were taken to Israel and accused of assisting the enemy during wartime, contact with a foreign agent, membership of and providing services to a terrorist organisation, and transferring funds to such a group. Both deny the charges.
Since their detention, the men have been held in cells under constant bright light, a practice intended to cause sleep deprivation and disorientation, according to Adalah. They are also blindfolded whenever taken out of their cells, including during medical examinations, which it described as a serious breach of medical ethics.