An Israeli journalist is in hiding in Britain, The Independent can reveal, over fears that he may face charges in the Jewish state in connection with his investigation into the killing of a Palestinian in the West Bank.

Uri Blau, a reporter at Israel's liberal newspaper, Haaretz, left town three months ago for Asia and is now in London. Haaretz is understood to be negotiating the terms of his return to Israel with prosecutors, according to an Israeli source, who declined to be identified, because of the sensitivity of the situation.

The news of Mr Blau's extended absence comes just days after it emerged that another Israeli journalist, Anat Kam, has been held under house arrest for the last three months on charges that she leaked classified documents to the press while completing her military service.

Although no media outlet or journalist has been specifically named as the recipient of the classified information, there is speculation on Israeli blogs that Ms Kam gave documents to Mr Blau that formed the basis of a story he wrote in November 2008.

In his article for Haaretz, Mr Blau reported that one of two Islamic Jihad militants killed in Jenin in June 2007 had been targeted for assassination in apparent violation of a ruling issued six months earlier by Israel's supreme court. While not outlawing assassinations in the West Bank altogether, the ruling heavily restricted the circumstances in which they were permissible, effectively saying that they should not take place if arrest was possible.

In an unusual move, Israel has placed a gagging order on national media, preventing them from reporting any aspect of the Kam case. Israel's Channel Ten and Haaretz are expected to challenge this order on 12 April.

According to the court order, Ms Kam, 23, is being held on "espionage" charges. It alleges that she passed classified documents to a male journalist while working as a clerk in the Israel Defence Forces Central Command during her military service.

She was arrested more than a year after Mr Blau's report, which was cleared by military censors at the time of publication, when she was working for the news service Walla, until recently owned by Haaretz.

Ms Kam denies all the charges. Her trial has reportedly been set for 14 April and she could face a lengthy prison sentence if convicted. Mr Blau did not respond to requests for comment; his friends and colleagues refused to discuss the case in detail.

Dov Alfon, Haaretz's editor-in-chief, said in an emailed statement: "Haaretz has a 90-year-long tradition of protecting its reporters from government pressures, and Uri Blau is getting all the help we can provide him with."

The move to gag Israel-based media has sparked fevered debate on Jewish blogs, which have freely reported the story. Bloggers have railed against the blackout, saying it represents a critical challenge to the freedom of the press.

"I do not believe that a citizen can be arrested and tried for suspected security offences right under our noses without anyone knowing anything about it," wrote former Haaretz editor Hanoch Marmari in an eloquent cri de coeur on the Seventh Eye website.

"Trials do not take place here in darkened dungeons, nor do we have show trials behind glass or chicken wire. I have no doubt that such a strange, terrible and baseless scenario cannot take place in such a sophisticated democracy as our own."