* Decision on arrest warrant seen after October

* Investigation of Kalma camp attack

* Prosecutors close to solving Lubanga trial impasse

By Reed Stevenson and Aaron Gray-Block

THE HAGUE, Sept 12 (Reuters) - A decision on an arrest warrant for Sudanese President Omar Hassan al-Bashir is likely to come later than the widely-expected date of mid-October, the International Criminal Court's top prosecutor said on Friday.

"Normally, when the judges start to analyse (a case) they call us for hearings and they ask for more information. They have not yet done that," ICC Chief Prosecutor Luis Moreno-Ocampo told Reuters in an interview.

"I don't know how long it will take, the judges will decide, but I don't think October would be possible," he said.

Bashir is accused of orchestrating a campaign of genocide in the Darfur region beginning in 2003 that has killed 35,000 people outright and at least another 100,000 through starvation and disease, with another 2.5 million forced from their homes.

Moreno-Ocampo said he had asked Sudan and the Arab League for an update on investigations into a recent attack in a refugee camp to determine whether it was an isolated incident or the start of a new wave of violence against civilians.

Sudanese forces attacked South Darfur's volatile Kalma camp on Aug. 25, leaving up to 27 dead and injuring more after surrounding the camp and going inside to search for weapons, according to rebel leaders.

Attacks usually take place outside the camps, the prosecutor said.

LUBANGA DEAL CLOSE

Speaking at the Hague-based ICC, set up to try suspected war criminals, Moreno-Ocampo also said prosecutors were close to resolving an impasse with judges over whether the trial against Congolese war crimes suspect Thomas Lubanga can go ahead.

The ICC halted Lubanga's trial in June, saying prosecutors had withheld from defence lawyers documents provided by the U.N. and others that could help Lubanga's case, because they were given on the condition of confidentiality to protect sources.

The number of documents previously unable to be disclosed has been whittled down to a handful from the initial 150, Moreno-Ocampo said.

"We're so close. Three documents are today the difference between us and the beginning of the trial. We are trying to find a solution," he said. "Victims have the right to have a trial. Lubanga cannot be released because there are three documents that could not be dislclosed. That, I think, is impossible."

Moreno-Ocampo last week visited Colombia, hit by violence between rebels, militias and state security forces, and said the ICC may also prosecute suspected war criminals there if local authorities face too many difficulties.

He said about 40 leaders of paramilitary forces had been arrested, some of whom were starting to confess to crimes.

But some suspects have stopped confessing, while others have been extradited to the United States, and Colombian authorities say this is affecting their ability to prosecute.

With more than 30 members of parliament allegedly connected with the paramilitary also facing prosecution, the ICC is closely following developments and Moreno-Ocampo met Colombian Supreme Court judges.

"If they say: 'Okay ... I cannot litigate the case', then I can do it," he said. (Editing by Andrew Roche)

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