SRINAGAR, India, Jan 21 - Police in Indian Kashmir have asked at least three journalists working in the region to sign a pledge vowing not to "disturb peace" in the region, two of them told Reuters on Wednesday. A third journalist, an assistant editor with the Indian Express newspaper, was summoned to a police station in Srinagar, the capital of the federal territory, but did not sign the pledge, the newspaper said in a report published on Wednesday.