* FTSEurofirst 300 down 1.2 pct; hits seven-week low
* Banks slip on Spain debt downgrade
* Royal Dutch Shell leads oils higher after profit soars
By Harpreet Bhal
LONDON, April 28 (Reuters) - European shares fell on Wednesday, with banks weak as worries over the fiscal health of euro zone peripheral countries intensified after Standard & Poor's downgraded its debt rating on Spain by one notch.
The pan-European FTSEurofirst 300 <
> index of top shares closed 1.2 percent lower at 1,056.89 points. It hit a seven-week low at 1,047.78 earlier in the day in a choppy session as concerns over debt problems in Greece, Spain and Portugal rattled investors' nerves.The index tumbled 3.1 percent on Tuesday, the biggest one-day fall in five months, when S&P slashed Greek debt to junk status and also downgraded its debt rating on Portugal.
European banks fell, with BBVA <BBVA.MC>, Banco Santander <SAN.MC>, Barclays <BARC.L> and Deutsche Bank <DBKGn.DE> down 1.4 to 4.7 to percent.
"It seems to be one (downgrade) after the other. Only a few months ago it looked like it was contained to Greece and in the last 24 hours we are seeing the contagion effect having a firm grip across Europe," said Manoj Ladwa, senior trader at ETX Capital in London.
S&P downgraded Spain to AA from AA-plus, with a negative outlook, saying a longer-than-expected period of low growth could undermine efforts to cut the budget deficit. [
]Greek banks <.FTATBNK>, however, rose 1.7 percent, after the country's securities regulator said it had banned short-selling in Greek shares until June 28. [
]Equities were also under pressure as investors worried about delays to an International Monetary Fund/European Union financial aid package for Greece and how much aid would be pledged.
A German parliamentary leader of the opposition Greens quoted IMF boss Dominique Strauss-Kahn as saying the package would be worth 100-120 billion euros over three years, higher than the initial package which was worth 45 billion euros ($59.94 billion) for this year.
Strauss-Kahn, however, said nothing had been decided on the size of aid to Greece. [
]Among the biggest fallers in the financial sector, Fortis <FOR.BR> shed 7.4 percent.
Bucking the weak trend in the sector, Nordea <NDA.ST>, the Nordic region's biggest bank by value, rose 4.3 percent after posting better-than-expected first-quarter operating profits and repeating its forecast for lower risk-adjusted profit this year.
Sweden's Handelsbanken <SHBa.ST> rose 3.9 percent. It reported a better-than-expected operating profit in the first quarter as loan losses and costs came in below forecast.
OILS RALLY
On the upside, Royal Dutch Shell rose 2.3 percent after it reported a 49 percent rise in first-quarter net profit thanks to higher oil prices and an unexpected return to production growth.
Within the sector, BP <BP.L> and BG <BG.L> 2.5 and 3.9 percent.
Shares Wall Street pared earlier losses, ahead of the Federal Reserve's decision on interest rates at 1815 GMT. The central bank expected to hold rates steady and repeat its low-rate vow. ID:nN27125552]
Britain's FTSE 100 index <
>, Germany's DAX < > and France's CAC 40 < > fell between 0.3 and 1.5 percent.Spain's IBEX 35 <
> index fell 3 percent and Portugal's PSI 20 < > was down 1.9 percent. (Editing by Mike Nesbit)