Lisa Dobriskey claimed a silver medal in the women's 1500m after a controversial finish at the World Championships.

Spain's Natalia Rodriguez attempted to overtake leader Gelete Burka down the inside with around 200m to go, but the pair collided and the Ethiopian was sent crashing to the track.

Rodriguez stumbled but was able to continue and crossed the line first ahead of Maryam Yusuf Jamal of Bahrain, with Dobriskey just 0.01s behind in third and American Shannon Rowbury a place further back in fourth.

Rodriguez was duly disqualified, meaning Jamal was promoted in the gold-medal position with Dobriskey taking silver and Rowbury picking up bronze.

For Dobriskey the result went a long way to making up for missing out on a medal in Beijing last year after a poor tactical run in the final.

"I'm chuffed to bits," she told the BBC. "The race was so surreal, it went by me. Last year I was so disappointed and I didn't want to finish in that position (fourth) again.

"I started the winter with a stress fracture in my lower back and was out for three months. At the end of May I had a bone stress (fracture) in my left thigh. I can't quite take it in at the moment.

"There are so many people I need to thank. Just to get me on the start line was a major achievement."

Dobriskey revealed she feared she would also be caught up in the incident with Rodriguez, adding: "I thought I was going to go down.

"It was so close to the finish I just thought 'Don't screw it up, don't come fourth or fifth,' and the opposite happened to Beijing, I was just running out of petrol in the last few metres.

"It's quite a satisfying feeling because I couldn't have done any more.

"It was a true championship race with lots of pushing and shoving and, having come through the rounds it really made me believe I'm a true championship performer now.

"I wouldn't like a silver medal on default, I would rather stick with the bronze."

And there was further success in the final event of the championships as Conrad Williams, Michael Bingham, Rob Tobin and Martyn Rooney claimed silver in the men's 4x400m.

After an excellent first leg from youngster Williams, Bingham took Britain into a second place they would only briefly relinquish to Australia midway through the third leg.

Tobin kept his cool to reclaim second place down the home straight and Rooney did likewise as Britain clocked 3:00.53, almost three seconds down on the dominant American quartet. Australia took bronze.

The team of Lee McConnell, Christine Ohuruogu, Vicki Barr and Nicola Sanders finished fourth in the women's 4x400m relay final, but were never in contention for a medal.

The United States took gold more than three seconds ahead of Jamaica with Russia third and Britain more than seven seconds behind the winners in fourth.

American Brittney Reese took the long jump title - which thankfully took place in much better weather than the torrential rain which marred qualifying - with a world-leading 7.10m.

Russia's Tatyana Lebedeva was second with 6.97m and Karin Mey Melis of Turkey third with 6.80m.

In the men's javelin, Andreas Thorkildsen of Norway took gold with a massive second-round throw of 89.59m, with Guillermo Martinez of Cuba claiming silver with 86.41m and Yukifumi Murakami third with 82.97m.

After the success of Caster Semenya, Mbulaeni Mulaudzi made it a South African double over 800m with a hard-fought victory.

Mulaudzi just held off Kenya's Alfred Yego and Bahrain's Yusuf Kamel to win in 1:45.29, with the top seven separated by 0.57s.

Britain's Mo Farah finished seventh in the 5,000 metres final as Kenenisa Bekele completed a first ever long-distance double.

Double Olympic champion Bekele, who won the 10,000m on Monday, claimed the 5,000m title after a frantic last lap in the Olympic Stadium.

The Ethiopian had unusually been forced to set the pace for some of the 12 and a half laps but still had enough left to win a sprint finish with America's Bernard Lagat down the home straight. James Kwalia C'Kurui of Qatar took bronze.

Farah, sixth in Osaka two years ago, had looked uncomfortable early on and sat at the back of the pack, but moved up to sixth at the bell.

But the Somalia-born 26-year-old was unable to live with the finishing burst of the leaders and had to settle for seventh in 13 minutes 19.69 seconds, 2.6secs behind the winner.

Farah said: "I felt all right, I just couldn't go with it. I tried to put myself in the right position. With 300m to go they started pulling away and I came round the bend and thought just hang in there but they changed gear again in the home straight.

"I'm disappointed, I was hoping I could come away with a medal and improve from two years ago but, looking back, I don't think I could have done any more.

"I gave 100% but my legs didn't feel as fresh as they could have. I had hoped the heats would have been easier but I had to treat mine as a final and work hard."

This morning China's Xue Bai powered away in the final kilometre to score a thrilling victory in the women's marathon.

Bai who fought a tough battle with Yoshima Ozaki and Aselefech Mergia towards the end of the race won in a time of two hours 25 minutes 15 seconds.

Ozaki of Japan who had no answer when the pace was raised finished 10 seconds behind while Ethiopia's Mergia who was dropped just after 40km, clocked 2hr 25min 32sec.