Two foreign activists from a Gaza-bound flotilla who have been detained in Israeli prison are facing psychological abuse, death threats and poor detention conditions, a rights group representing them said Monday. "Thiago Avila (one of the activists) reported being subjected to repeated interrogations lasting up to eight hours. Interrogators have explicitly threatened him, stating he would either be 'killed' or 'spend 100 years in jail'," rights group Adalah, whose attorneys visited both activists in their detention Monday, said in statement. Adalah added that a court would decide Tuesday whether to further extend Spanish national Saif Abu Keshek and Brazilian Avila's detention.