A Chinese coast guard ship and a Vietnamese fisheries patrol boat apparently had a tense encounter during the weekend in the South China Sea, coming as close as 10 meters to each other, according to data from Marine Traffic, a ship-tracking website.

The data, based on the ships’ automatic identification system (AIS) signals, shows that the China Coast Guard ship, CCG5205, and Vietnam’s Kiem Ngu 278 came “crazy close” to one another at around 7 a.m. on Sunday local time (midnight UTC), said a researcher based in California.

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