Nato moved into the third week of its campaign with the heaviest bombardments of Serbia so far, and ended the week with an announcement that it was bringing in large-scale reinforcements. The week saw a public relations setback for Nato, with a missile strike hitting a passenger train, killing ten people. The refugee crisis continued, and Nato ground troops were sent to Albania to help with relief efforts.

Follow the third week of the Nato campaign in this day-by-day guide. Read the main stories, BBC analysis and the best video and audio clips.

Use the options on the left to return to latest news and other current BBC coverage.

Nato reinforces
Nato announces a massive reinforcement of its operations, as Yugoslavia says strikes target a hydroelectric plant and railway bridge.

• Blair unveils troop build-up
• 'Some progress' in US-Russian Kosovo talks
• Serbs warned over cross-border raid
• SAS 'on ground in Kosovo'
• Refugees tell of systematic rape
• Montenegro rejects 'Slavic alliance'
• KLA launches recruitment push

Multimedia
Tony Blair: "Substantial reinforcements"
"Every day, more young men come back to fight the Serbs": David Loyn
"Russia could play a key role": Janet Barrie

Missiles hit train
Nato presses on with its operations, but admits its forces destroyed a passenger train in an attack on a railway line in Serbia in which ten people were killed.

• When war goes wrong
• Nato presses on
• Albania urges Nato to target Serbs on border
• Belgrade editor shot dead
• Harriers 'winning weather battle'
• Hungary waves aid convoy through
• Eyewitness: The great scattering of refugees

Multimedia
"Worst Nato error so far": John Simpson
Nato commander Wesley Clarke: "Determined we will not lose"
Eyewitness: Matt Frei talks to a family who fled terror
Albanian Foreign Minister Paskal Milo: "We need a long-term solution"

Nato gets Albanian launchpad
The Albanian Government hands over control of its airspace, ports and military installations to support the Nato bombing campaign against Yugoslavia.

• Refugees trapped in Kosovo
• Serb TV parades Australian 'spy'
• Unease across the Hungarian border
• Russian aid held up
• London demo urges end to strikes
• Picture gallery: Nato's arsenal
• Serbian media: Easter under air raids

Multimedia
   Stephen Gibbs: Nato says its air campaign is working
   Albanian Foreign Minister Paskal Milo: Need a long-term solution to Kosovo

New exodus from Kosovo
The expulsion of refugees from Kosovo appears to have restarted, prompting fears of a new wave of ethnic cleansing.

• Weather dampens air strikes
• Orthodox Easter under the bombs
• Mission to free soldiers fails

Analysis
Jonathan Marcus: Why Nato will not say "war"
Monitoring: "Nato lies over rapes"
Kevin Bishop gives a journalist's view of the conflict

Multimedia
   Lindsay Marnoch: "Opinion on both sides seems to be hardening"
   Duncan Kennedy: Refugees were stripped of their money, valuables and documents

Kosovo 'could spark world war'
President Yeltsin warns that the Kosovo conflict could escalate if Russia is forced to intervene.The Nato bombing of Serbia continues over the Orthodox Easter.

• Refugees 'lost' in Kosovo
• Uranium weapon fears in Kosovo
• Israel divided on Kosovo
• Serbs 'raping refugees'
• Milosovic 'is feeling the heat'
• Refugees arrive in Germany
• Picture gallery: Life in the camps
• Human chains guard Nato targets

Profiles
Madeleine Albright: Haunted by history

Analysis
Tom de Waal assesses Russian public opinion
Gabriel Partos on the fortunes of the KLA
Monitoring: Propaganda war hots up

Multimedia
   Brian Hanrahan: Worrying statements emerging from Russia
   Duncan Kennedy on the dilemmas for the KLA

Ground troops to Albania
Nato decides to send 8,000 troops to Albania to help with the refugee effort. There are new warnings from the West that refugees inside Kosovo may be used as human shields.

• Missing refugees traced
• Pristina - a deserted city
• Picture gallery: Pristina in ruins
• Albright denies prosecuting 'personal war'
• 'I saw my town bombed' - UK Serb
• Serb TV: Nato's mission impossible
• Blair: No troops for Kosovo
• Journalists freed after stand-off
• War crimes call grows

Analysis
Jonathan Marcus: Is Nato's campaign working?

Multimedia
   John Simpson in Pristina: "The living get out and even the dead can't lie in peace"
   Fergal Keane on the Albanian border

Refugees go 'missing'
Macedonia removes 30,000 refugees from its border camps. The UN expresses concerns for their safety. The Nato bombing campaign intensifies further.

• Serb ceasefire answered with more heavy strikes
• Harriers hit Serb forces in Kosovo
• Milosevic 'to release US soldiers'
• Picture gallery: Moving out the refugees
• Airlift 'could add to refugee trauma'
• Downed fighter pilot tells of ordeal
• Fears for neutral Montenegro
• Nato aims for 'war crimes' units

Eyewitness
Kate Adie reports from the USS Nicholson on a 'curious lack of interest' out at sea

Analysis
Discord mars EU refugee effort

Multimedia
   Ben Brown reports from the deserted border: "The aid workers can hardly believe it"
   Paul Royall on the overnight Nato bombardment
   Jeremy Bowen on the "smell of violence" in Montenegro
   Jill Dando presents the Kosovo crisis appeal

Refugee exodus
Full BBC coverage of the second week of Nato's action with links to original stories, transcripts + BBC audio and video reports.
BBC reports include: Nato intensifies bombing, central Belgrade and key bridges hit, refugee exodus from Kosovo increases massively, three US soldiers captured by Serbia.

Serbia bombed
Full BBC coverage of the first week of Nato's action with links to original stories, transcripts + BBC audio and video reports.
BBC reports include: First raids, reports of scorched earth policy in Kosovo, Nato loses Stealth fighter, refugees tell stories of atrocities, Nato starts round-the-clock air attacks, Russian mediation comes to nothing.