Media reports, citing law officials and the state news agency, said earlier on Friday that 20 suspected members of Fatah al-Islam had been charged with terrorist acts, including the murders of Lebanese troops, in recent battles at the Nahr al-Bared refugee camp in northern Lebanon.
"We do not have any information confirming the reports at the moment, and are trying to contact the top prosecutor's office in Lebanon," the embassy's press attache said.
The Russians were identified as Sergei Vysotsky, born in 1989, Taimur Koskov, born in 1987 and Aslan Imkudzhayev, born in 1987, and a man nicknamed as Abu Abdallah, a resident of the largely Muslim Russian republic of Daghestan.
Only Vysotsky is currently imprisoned. If convicted, the suspects could face the death sentence.
More than 430 people, including 168 soldiers and 226 militants, were killed during the recent operation by the Lebanese Army to root Islamists out of the Nahr al-Bared refugee camp in northern Lebanon.
