The opposition Samajwadi Party on Thursday demanded a judicial probe into the Greater Noida police firing, which left four people dead and scores injured.
A delegation of six SP MPs tried to enter Uttar Pradesh but was detained at the Delhi-UP border by police. They were let off after three hours.
SP's Rajya Sabha member Uday Pratap Singh told PTI that the magisterial probe ordered by the government was an eye wash.
"The government itself is a party to it. Only a judicial probe will enable the truth to come out," he said.
Besides Singh, the other MPs detained included Ramji Lal 'Suman', Rajendra Kumar, Baleshwar Yadav, Ram Narain Sahu and Kamal Akhtar.
The SP delegation also handed over a memorandum to the Gautam Buddha Nagar district administration demanding Rs 10 lakh as compensation to the family members of each of the agitators killed in police firing.
"India largely depends on agriculture. But police here has used force to suppress the justified demands of farmers who were merely demanding enhanced compensation for land taken over," Singh added.
Four persons were killed and 50 injured, including 15 policemen, in police firing and clashes yesterday after the farmers' agitation near Greater Noida Development Authority office turned violent.
The farmers were demanding enhanced compensation for their land acquired in 2003 and 2005 by the Uttar Pradesh government on the lines of those acquired in 2008.
UP Cabinet Secretary Shashank Shekhar Singh, meanwhile, reviewed the situation in Greater Noida last night, official sources said on Thursday.
The state government has announced a compensation of Rs three lakh to the kin of those killed and Rs 50 thousand each to those injured.