Mumbai, Jul 13 (PTI): In a big turnaround, the benchmark Sensex jumped over 340 points to reclaim the 28,000-level in pre-close trading today on across-the-board buying after Greece sealed a crucial bailout deal with the euro zone.

The 30-share index regained the psychological 28,000-mark -- for the first time since July 8 -- by surging 340.43 points, or 1.23 per cent, at 28,001.83 in afternoon trade.

Sentiment got a push after global markets climbed following Greek developments today, which had stretched into marathon overnight talks in an attempt to prevent its potential exit from the single currency union, brokers said.

All sectoral indices led by IT, technology and healthcare, were trading in the positive zone with gains of up to 1.69 per cent.

Also, the 50-share Nifty was trading higher by 100.65 points, or 1.20 per cent, at 8,461.20.

Those who notched up solid gains include Infosys, Wipro, TCS, GAIL, HDFC, NTPC and Sun Pharma.

Broader markets were also in a better shape, with the small-cap and mid-cap indices adding up to 1.24 per cent.

Globally, Japan's Nikkei was up 1.57 per cent, Shanghai Composite jumped 2.39 per cent and Hong Kong's Hang Seng gained 1.30 per cent.

European markets were higher in early trade.