Maoist rebels detonated land mines and set a security outpost ablaze in eastern India, killing at least 24 policemen in the worst-ever attack on police in the restive area. An additional seven officers were wounded in the brazen assault Monday by more than 100 communist fighters, who also stole weapons from the security post in Shilda village of West Bengal state, said district magistrate N.S. Nigam. ''Never before the police here have suffered so many losses in one attack,'' Surajit Kar Purkayastha, a police inspector-general, told The Associated Press on Tuesday.