Clearly the article is referring to the fact that the border is not properly demarcated at the site and that both countries are conducting a survey in the disputed area. There must have been some communication gap between the surveyors from both sides.
Another article from Dhaka Mirror says that the BSF withdrew within an hour.
http://www.dhakamirror.com/?p=7434
Dhaka Mirror reporting is as follows:
BSF occupies vast land on Pratpur frontier in Sylhet
August 12, 2009
BDR on red alert
Aug 11: Indian BSF troops today suddenly massed in and occupied a vast tract of Bangladesh land on Pratpur frontier in Goainghat upazila, triggering tensions among people in the border area as they recalled a 2001 clash between the two forces.
Bangladesh Rifles (BDR) sources said the trespassing Indian border guards retreated in the face of strong position taken by the BDR jawans.
According to BDR and local sources, a group of 70-80 BSF members of Padua camp moved 300 meters into the Bangladesh territory at about 12 noon and entrenched their armed positions hoisting red flag.
The Indian side claimed the ownership of 500 acres of land close to border pillars no 1270, 1271, 1272, 1273, said Pratapur BDR outpost commander Naik Subedar Joynul Ahmed.
“BDR personnel staged instant protest, hoisted red flag and asked the BSF intruders to quit the land. But, the intruding BSF declined to leave the area. Consequently, BDR issued red alert hoisting the red flag,” says a report from the area.
People living in the frontier area said the BSF built up its strength after forcibly occupying the land. This created panic among the frontier people.
BDR 21 Battalion Commander Lt Col Zahirul Alam said, “The BSF men had to retreat at about 1pm in the wake of tough position taken by the BDR and strong protests.”
Director General of BDR Maj General Mainul Islam told the news agency that there have been some adverse possessions of land in India and Bangladesh since the Pakistan times. “Our position is to maintain our previous respective positions and the joint border working group will settle the matter,” he said.
A BDR-BSF skirmish was triggered by such possession of land in the same area by the Indian Border Security Force members in 2001, at the fag-end of the previous Awami League government’s rule. In a chain action, a brief encounter occurred on the northern Burimari frontier in Lamonirhat district.
Courtesy of UNB, SYLHET
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It is good to know the BSF has withdrawn after one hour. But, BSF should avoid adventurism and stop intruding and then grabbing our land. Our BDR is strong-willed, but our pajama-clad politicians are not. But, a day will again come when BDR will repulse with force if the situation becomes untenable for them. Showing red eyes by a big India will not dissuade them from protecting our border.