A probe into financial deals of the Indian Premier League (IPL) was broad-based Wednesday with searches at offices of three of its event management and broadcast firms in Mumbai, even as the Enforcement Directorate (ED) registered a case to investigate foreign exchange violations by its franchisees.

Also, the income tax probe which started with the IPL Kochi franchise last Wednesday was widened Thursday with simultaneous searches in multiple cities.

Tax officials who conducted search operations at the offices of the Bengal Cricket Association and Shah Rukh Khan's Kolkata Knight Riders till the early hours of Thursday here claimed to have found "incriminating evidence" of irregularities.

"We have found incriminating evidence. We will investigate further. We needed to have a look at certain transactions and we've found whatever we were looking for," said Indian Revenue Service Deputy Director Akhilendu Jadhav.

The main angle that the sleuths of the Directorate of Income Tax Investigation were looking for on the probe into the Indian Premier League (IPL) franchises was the legality of money transfers from tax havens abroad, primarily Mauritius, officials explained.

This apart, officials of the Directorate of Enforcement were probing the legitimacy of transactions between the franchise and the state's cricket board, the officials added.

Searches at both the board's office at the Eden Gardens stadium and the premises of Kolkata Knight Riders and its parent Red Chillies Entertainment of actor Shah Rukh Khan at ITC Sonar Bangla and Shakespeare Sarani began at 3 p.m. Wednesday.

The 10 franchisees under scrutiny are Kochi's Rendezvous Sports, Pune's Sahara group, Mumbai Indians, Delhi Daredevils, Kolkata Knight Riders, Royal Challengers Bangalore, Deccan Chargers, Chennai Super Kings, Rajasthan Royals and Kings XI Punjab.

Earlier in Mumbai, a team of over 50 officials of the Directorate of Income Tax Investigation started the search operations at the premises of Multi Screen Media, World Sports Group and Pat Magnarella Management in Bandra, Khar and Malad suburbs of north-west Mumbai in the morning.

Simultaneously, the ED Mumbai registered a case against "unknown persons" under the Foreign Exchange Management Act to probe unauthorized transfer of huge foreign funds without the permission of the Reserve Bank of India (RBI).

The ED move was prompted by information that huge funds have found their way into the IPL from international tax havens. It would inquire into the root of the IPL finances from dubious sources, officials said.

Earlier called Sony Entertainment Television, Multi Screen Media has the telecast rights for the IPL T20 cricketing extravaganza for 10 years from 2008, while World Sports Group acquired the global media rights for IPL for 10 years for over $1.5 billion.

Pat Magnarella Management is a full-service management, branding, and marketing services company, which in the past specialised in the music business and later made a foray into sports as well, officials said.

In New Delhi, another investigative wing of the finance ministry, the Directorate of Enforcement, registered a preliminary case against the IPL and its franchisees to probe possible violations of foreign exchange rules and regulations.

The case was registered under the provisions of the Foreign Exchange Management Act in a bid to help the directorate's officers search the premises of suspected people, seize incriminating material and hold enquiries, officials said.

A probe by the tax department had first started with the Kochi franchise of IPL last Wednesday. A day after, officials from the income tax department visited various offices of the IPL in Mumbai and questioned its commissioner Lalit Modi.

Based on the documents collected, the tax probe was then extended to other cities as well, following which all the wings of the finance ministry were roped in for parallel investigations.

Finance ministry officials said their main concern was whether ill-gotten money stashed abroad was being brought back into the country, as also whether there was tax evasion by IPL and its franchisees.

The question of free equity to some directors of franchises is also being probed.