Britain's FTSE rebounds from four-month low after EU campaign suspended

* FTSE 100 up 1.2 pct

* Shares (Berlin: DI6.BE - news) set for third straight week of falls

* Under-pressure banks rebound

* National Grid (LSE: NG.L - news) falls (Adds detail and quote, updates prices)

By Kit Rees and Alistair Smout

LONDON, June 17 (Reuters) - Britain's top share index rose from a four-month low on Friday, as stocks that have been hardest hit by concerns over a possible British exit from the EU rebounded after campaigning was suspended following the killing of a British lawmaker.

The FTSE 100 rose 70.03 points, or 1.2 percent, to 6,020.51 points. It (Other OTC: ITGL - news) remained down 1.6 percent for the week and was set for its third straight week of falls.

Banks were among the top gainers, with Lloyds, Barclays (LSE: BARC.L - news) , Standard Chartered (HKSE: 2888.HK - news) and RBS (LSE: RBS.L - news) up 4.2 percent to 5.2 percent.

The sector dropped to a two-month low on Thursday, after polls showed momentum was shifting in favour of the campaign to leave the European Union in next week's referendum.

However, campaign activities were halted late on Thursday, with Britain's politicians and public left in shock after a pro-EU lawmaker was fatally shot in the street.

One poll set for publication on Friday was delayed until the weekend, and traders said the focus had shifted away from the campaign in light of the attack. The probability that Britain votes to stay in the EU also increased, bookmaker odds showed.

Investors saw the pause in referendum activity as a chance to buy recently sold stocks, as well as commodity shares, which were boosted by a rising oil price.

"With Brent Crude now back approaching $48 per barrel... it seems that the UK index may have found its trading bracket for the next week, with it struggling to push significantly above 6000 but failing to fall too far below 5900," said Connor Campbell, financial analyst at Spreadex.

"Of course, as those pre-referendum fears really ramp up next week that could change."

Energy shares contributed around 8 points to the FTSE 100's rise, as Brent crude rose for the first time in over a week.

Gains were broad-based, with only around a dozen stocks in negative territory.

Among the top fallers, National Grid retreated 1 percent after a bearish broker note from Credit Suisse (LSE: 0QP5.L - news) , which cut its price target on the stock, and a call from British lawmakers for an independent operator to take over the company's role running the country's energy transmission network.

"Shareholders will be hoping that the shape of the company will not affect their payout, but the uncertainty could mean that the firm becomes less attractive versus other high-dividend paying names," Chris Beauchamp, senior market analyst at IG (LSE: IGG.L - news) , said in a note.

Precious metal miners Fresnillo (Other OTC: FNLPF - news) and Randgold also fell. They had been among the main beneficiaries of the "risk-off" sentiment that had characterised most of the trading week.

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Mike Dolan, Markets Editor EMEA. (Reporting by Alistair Smout; Editing by Janet Lawrence and John Stonestreet)