The Civil Guard launched another corruption operation on Wednesday morning in Madrid, arresting the former Popular Party (PP) First Minister of the region, Ignacio González, who governed from 2012-2015, along with 11 others.

The investigation, into what has now become a standard range of fraud charges, is related to the publicly owned company Canal de Isabel II de Madrid, which is responsible for water management in the Spanish capital and the surrounding region.

It centres on allegations the company purchased South American companies at above-market prices while Mr. González was First Minister, El País reported.

The Popular Party announced on Wednesday morning that he had been suspended.

Francisco Marhuenda, the editor of right-wing daily La Razón, along with the chairman of the newspaper, Mauricio Casals, are being investigated for trying to coerce the current (PP) First Minister of Madrid, Cristina Cifuentes, regarding those operations and the role of Edmundo Rodríguez Sobrino, arrested by the Civil Guard on Wednesday.

Mr. Marhuenda is very well known in Spain, appearing regularly on TV talk shows to defend Prime Minister Mariano Rajoy and conservative ideas.

The programme he most often appears on is broadcast on La Sexta, which is owned by Atresmedia Corporation. Atresmedia also owns another popular Spanish TV channel, Antena 3.

Mr. Casals is the chairman of La Razón and sits on the board of Atresmedia Corporation, which as well as the two popular TV stations also owns radio stations Onda Cero and Europa FM.

The corporation's TV channels account for 27% of audience share in Spain, according to figures presented in the company's 2016 annual results.

Compared to Mr. Marhuenda, Mr. Casals is a more obscure figure, sometimes profiled as a shadowy, but very powerful, media baron with good connections to the very top level of Spanish politics.

Atresmedia Corporation is listed on the Madrid general exchange (IGBM) with a market capitalisation of €2.6 billion and full-year revenue for 2016 of €1.021 billion.

It is due to present its results for the first quarter of 2017 on Friday.

The main shareholder in Atresmedia Corporation, and the owner of La Razón, is the publishing group Grupo Planeta.

Mr. Marhuenda had been due to participate in round table debate on "media and the presumption of innocence" at 5 p.m. on Wednesday, in the town of Tomares, near Seville.

He cancelled his appearance at the event, local site Sevilla Actualidad reported.

Update: Atresmedia replied to The Spain Report on Wednesday evening, but said they would not be making any comments regarding the investigation of Mr. Casals.

Update 2: Grupo Planeta also replied late on Wednesday evening, and also declined to make any comment.