Stage 15: Bagnères-de-Bigorre - Luz-Ardiden - 159.5km.
All the Tour de France action as it happened (All times BST).
Armstrong recovers from a painful fall to win the stage with an incredible display.
Ullrich trails the American in third place behind Mayo some 40 seconds behind.
Vinokourov comes in two minutes and six seconds adrift.
1557: Ullrich is given third place behind Mayo, 40 seconds behind Armstrong. Vinokourov trails in two minutes and six seconds behind.
1556: Armstrong takes his first stage of this year's Tour in four hours, 29 minutes and 26 seconds.
1550: Ullrich is fighting back and reduces the gap between himself and Armstrong to 45 seconds.
1547: Ullrich trails Armstrong by one minute and 20 seconds.
1544: Armstrong moves into the lead with 4km to go and continues to put daylight between himself and the rest of the top riders.
1541: Armstrong is closing in on Chavanel and stretching away from Ullrich's chasing pack in a display that illustrates why the American is going for his fifth straight Tour.
1534: Armstrong forges ahead with real fortitude to recover from the fall and is surging away from Ullrich. Vinokourov cannot keep up with them.
1530: Incredibly, Armstrong almost goes again as his foot springs out of the pedal, but the American has not lost too much ground or time as the other riders sportingly decide not to take advantage.
1528: Armstrong makes a break alongside Mayo but crashes badly as a spectator gets too close. Ullrich manages to avoid the collision and moves into second place.
1526: Vinokourov has recovered impressively to rejoin Armstrong and Ullrich in the group behing leader Chavanel.
1522: Armstrong and Ullrich look to be biding their time with no rider in the group making a decisive break as yet.
1520: Vinokourov is cutting the defecit, now trailing the yellow jersey group by approximately 40 seconds.
1511: The yellow jersey group of Ullrich, Mayo, Zubeldia and Armstrong is joined by Moreau, Hamilton and Basso as the descent continues. Vinokourov is nearly 90 seconds behind them.
1500: Ullrich and Armstrong and their group start the steep descent on the other side of the Col du Tourmalet.
1453: Chavanel reaches the summit of the Col du Tourmalet in first position, but Botero - on team orders - takes it easy to help out Telekom team-mate Vinokourov.
1446: Vinokourov is starting to feel the pace as the climb really making the riders work hard. Ullrich and Armstrong are staying wheel to wheel in third and fourth place.
1439: Ullrich makes a dramatic move that looks to have left Armstrong behind, but the American manges to reel him back in.
1428: The peloton is becoming increasingly fragmented, but all the top riders - Armstrong, Ullrich, Vinokourov and the rest of the overall top 10 - are all sticking together.
1422: The Col du Tourmalet is separating the men from the boys as the peloton starts to stretches out. Simoni, Casar, Millar and McEwen all drop out of contention.
1405: With his 18 points in fourth place over the Col d'Aspin, Virenque effectively seals the King of the Mountain title as he establishes a 141-point lead over Dufaux.
1401: Armstrong starts his move through the field as he moves towards the front of the peloton, but he is being closely watched by Virenque.
1355: In the race to be King of the Mountains, Chavanel takes 30 points, Botero 26 and Chaurreau after they reach the top of the category one Col d'Aspin.
1343: As the US Postal team continue to force the pace in the peloton, Lotto's Hans De Clercq drops off the back.
1335: Ullrich is back with the peloton but there is no sign of Botero and Chavanel being hauled back - they now lead the peloton by nine minutes.
1330: Jan Ullrich suffers a puncture on the Col d'Aspin and, after a tyre change, is attempting to rejoin the peloton.
1325: With 12km of the Col d'Aspin to climb, Botero and Chavanel have moved over eight minutes clear of the peloton, with Chaurreau still alone in second.
1314: Botero and Chavanel reach the start of the climb of the Col d'Aspin.
1310: Sylvain Chavanel led Santiago Botero over the line at the second intermediate sprint, and the pair now lead Chaurreau by 3:40 and the peloton by 5:20.
1300: After 60km, Botero and Chavanel continue to increase their lead, which is now 2:20 over Chaurreau and 4:30 over the peloton.
1252: Chaurreau has broken away from the peloton and trails the leaders by two minutes, with the peloton now three minutes 20 seconds behind Botero and Chavanel.
1240: The peloton regroups with Botero and Chavanel one minute 20 seconds clear. David Millar has been dropped by the peloton.
1225: Chavanel leads Botero over the line at the first intermediate sprint, while Portal and Dumoulin attempt to bridge the gap from the peloton.
1220: Halgland is dropped but Botero and Chavanel press on and now lead by over one minute.
1210: Botero has made several attacks and goes again, this time with Chavanel and Halgland, quickly building a lead of 20 seconds.
1204: The group of 15 is caught by the peloton at the start of the first climb of the day. David Millar of Cofidis is struggling to stay at the back of the pack.
1202: Hincapie, Azevedo, Botero, Pascual Llorente, Aerts, Portal, Glomser, Bettini, Commesso, Poilvet, Chavanel, Flickinger, Vogondy and Oriol make up the breakaway group.
1152: A group of 15 riders - Armstrong, Ullrich and Vinokourov not among them - has broken away from the peloton and quickly moved 10 seconds clear.
1145: No sign of the leading trio of Armstrong, Ullrich or Vinokourov yet, but Armstrong's US Postal team are prominent towards the front of the peloton.
1138: The early pace is very fast, leaving the peloton strung out, but several attacks have come to nothing.
1130: Boogerd is quickly caught by the peloton.
1125: The stage proper gets underway and Michael Boogerd of Rabobank gets straight down to business with an early break.
1120: The peloton rides out to the start of one of the shortest stages in the Tour, but one which includes the Col d'Aspin, the Col du Tourmalet and the climb to Luz-Ardiden.