Task: Question Answering
Input (English): Passage: According to official records, the British government lost 43 troops with 126 wounded, while 2337 rebels were killed, another 1652 injured and 45,404 imprisoned. Unofficial estimates put the number at 10,000 killed and 50,000 imprisoned, of who 20,000 were deported  while around 10,000 went missing. The number of civilian casualties is estimated at between 500 and 600. Official estimates of forced religious conversions of Hindus were put at 180, but unofficial estimates suggest a figure of between 1000 and 1500. Arya Samaj sources reported a number of 1766, adding that the total might exceed 2500, the highest estimate made. Out of a total of almost 50,000 Mappilas involved in the rebellion, 678 were charged with the crime of forced religious conversion, not all of who were guilty of involvement. Within five years subsequent to the conflict the agricultural output was averaging slightly more than prior to it. Qureshi has said that, "In short, contrary to popular belief, Malabar did not suffer a massive devastation, and even if it did the recovery was miraculous.". 
Question: How many is the highest estimate of civilian casualties? 
Answer type: Number 
Output (English): 600.