Post offices in Chiang Mai have impounded more than 2,000 letters believed mailed by some ill-intent political elements to scuttle the draft constitution which is due to go through a referendum on August 7.

The mysterious letters seized in Chiang Mai are similar to those earlier impounded in Lampang. The letters do not have the names of the receivers or the senders but just the addresses of the receivers. Most were however stamped.

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