Sebi's main contention against brokers is that the NSEL was offering paired contracts and they were forward contracts, which were "illegal".
Silver also turned weak and declined by Rs 400 to Rs 42,600 per kg on poor offtake by industrial units and coin makers.
Sentiments remained subdued largely in tandem with a weak trend in global markets where gold traded at a four-year low as surging dollar waned demand for the precious metals, traders said.
Authorities also released photographs of six suspects, including three women, wanted for their involvement in the attacks and sought information regarding them from the public.
In Mumbai, gold traded higher at Rs 30,330 per 10 grams and silver traded lower at Rs 44,400 per kg.
Traders said increased buying by stockists in line with a firm global trend, as investors awaited the US jobs report and the impact on the monetary stimulus, mainly boosted the sentiment.
Traders said lack of buying support from retailers and jewellers who preferred to keep their activity restricted, anticipating further fall in coming days, mainly kept gold prices unchanged.
Tracking a weak trend overseas and low demand from domestic jewellers and retailers, gold prices plunged by Rs 200 to Rs 26,350 per ten gram in New Delhi on Monday.
'We will be voting keeping in mind the brunt we bore because of demonetisation and high GST rate'
Traders said sentiments turned bearish after gold fell to three-week low in global markets as a stronger dollar curbed demand after the Federal Reserve ended its asset-purchase programme because of an improving labour market.
Traders said fall in demand from jewellers and retailers due to end of festive season and a weak global trend where gold retreated from a six-week high as investors expected the Federal Reserve to end its bond-buying programme this week, eroding safe-haven demand, mainly pulled down precious metal prices here.
Dabba trades also allow investors to avoid SEBI registration requirements or the margin requirements set by exchanges.
Last year on Dhanteras, the precious metal stood at Rs 31,400 per 10 grams.
Surat had bagged the fourth rank under the Smart Cities Mission based on its proposal.
Traders said continued buying by stockists driven by ongoing marriage season mainly led to rise in gold and silver prices.
Diversion of funds towards the surging equity weighed on the precious metal's price
Silver also rose 0.8 per cent to $16.63 an ounce.
Silver recovered by Rs 100 to Rs 36,950 per kg.
Silver also fell for the third day.
The stubbornly high global crude oil prices are opening up a can of worms to heightened inflation risks and likely to disrupt government's fiscal maths along with deteriorating global financial conditions.
Gold prices plunged by Rs 410 to trade at over two-week low of Rs 27,790 per 10 grams at the bullion market on Monday.
Traders said brisk buying by stockists for the ongoing wedding season mainly led an upsurge in precious metal prices.
Traders said sentiments turned better after gold recovered from an eight-month low in global markets on speculation that reduced prices may spur purchases before the Federal Reserve begins a two-day policy meeting.
Traders said sustained buying by stockists in line with a firming global trend mainly boosted the sentiment.
Silver also recorded a sharp fall of Rs 1,000 to Rs 37,400 per kg.
The slide in gold continued for the second straight day, with prices tumbling by Rs 200 to Rs 28,100 per ten gram at the bullion market on Friday largely in tandem with a weakening trend overseas amid low demand from jewellers.
After Wednesday's rise, gold prices drifted by Rs 190 to close at Rs 27,610 per ten gram in New Delhi on easing demand from jewellers and retailers amidst a weak global trend.
Silver also reclaimed the Rs 34,000 per kg mark.
Gold prices rebounded by Rs 190 to Rs 31,000 per ten grams in the national capital today on pick up in festive season demand.
As the Congress party prepares to launch protests against the economic slowdown, Chhattisgarh Chief Minister Bhupesh Baghel tells Archis Mohan that his state has escaped its effects as his government has pursued policies that have put money in the pockets of workers, farmers, housewives and tribals, which has helped spur demand.
Silver also rebounded by Rs 530 to Rs 43,930 per kg on increased offtake by industrial units and coin makers. It had lost Rs 100 on Wednesday.
China's foreign trade is expected to hit a record $1.1 trillion with an annual growth of about 30 per cent this year, ranking the nation as the world's third largest trader, the Chinese government said in Beijing on Friday.
Extending gains for the second day, gold prices moved up by another Rs 70 to Rs 28,300 per ten gram in the national capital on Friday on increased buying by jewellers and retailers, driven by festive season demand coupled with firming global trend.
Traders said sentiments in gold turned bearish after it plunged in overseas markets on speculation that US interest rates will increase next year, curbing demand for the metal as a store of value.
Traders said apart from increased buying by jewellers and retailers to meet seasonal demand, a firming trend in global markets on increased tensions in Ukraine and weakening dollar mainly influenced precious metal prices.
Traders said rebound in gold prices was mostly in tandem with a firming global trend on speculation that prices near a two-month low will spur purchases.
Traders said sustained selling by stockists against sluggish demand and weakening global trend mainly kept pressure on precious metals.
Silver also lacked necessary follow-up support from industrial units and coin makers and lost Rs 300 to end at Rs 43,000 per kg.
Sources said the Congress Parliamentary Party authorised Gandhi to pick the party's leader in Lok Sabha.