By Robert Fisk in Belgrade
Blood is beginning to spatter Nato's campaign in Yugoslavia. Just under two weeks ago, it was the blood of 26 Serb civilians in the town of Aleksinac. Then on Monday, it was the blood of 27 Serb passengers - the latest figure for fatalities - on a railway train bombed by a Nato jet.
Yesterday, up to 60 Kosovo Albanian refugees were reported torn to pieces by Nato bombs in Kosovo. That phrase "collateral damage" is beginning to sound ever more obscene.
Needless to say, the Serb government is happy to publicise these atrocities - just as Nato is ready and willing to report every atrocity committed by Serb forces in Kosovo. But Nato's new ground rules are playing into Serbian hands.
For it is becoming clearer that somewhere - in Washington, perhaps, or Brussels or the Aviano air base in Italy - someone has decided that Serb civilians must suffer for their country's sins. Or that their lives can now be regarded as forfeit if they live near a barracks or an airfield or happen to be on a passenger train.
The Serb authorities - who denied the stories told by thousands of Albanian refugees of "ethnic cleansing" at the hands of Serb forces - were quite specific in their description of the slaughter of as many as 75 Albanian refugees, first near the village of Medjan, at 1.30pm, then at Bistrazin at 3pm. The Kosovo Albanians were travelling in cars and tractors, "escorted" by at least three Serb policemen. The policemen were also killed.
Did Nato believe these were Serbs driving down the roads of southern Kosovo? Or did they see military traffic and decide - as they did when they bombed a barracks 50 metres from a Belgrade hospital on Tuesday - that the risk of harming civilians was worth taking? That now seems to be Nato's policy in its bombardment of Yugoslavia.
Wesley Clark, the general who thought he could fight a war without ground troops, gave a deeply unsettling performance this week when he tried to explain the train massacre.
The pilot saw the train enter his bomb frame only at the last second, he said. But then - incredibly, knowing the train was there - he returned to fire two more missiles at the railway bridge.