truncate tables with foreign key reference

I have three tables in sql server database. Table1 as:
 CREATE TABLE [IA_report] (
      [report_id] [int] IDENTITY (1, 1) NOT NULL ,
      [report_yr] [smallint] NOT NULL ,
      [report_nbr] [smallint] NOT NULL ,
      [finalized_dt] [datetime] NOT NULL ,
      [committee_dt] [datetime] NOT NULL ,
      [is_confidential_ind] [bit] NOT NULL ,
      [type] [varchar] (32) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL ,
      [keyword] [varchar] (32) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL ,
      [title] [varchar] (200) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL ,
      CONSTRAINT [pk_IA_report] PRIMARY KEY  NONCLUSTERED
      (
            [report_id]
      )  ON [PRIMARY] ,
      CONSTRAINT [fk1_IA_report] FOREIGN KEY
      (
            [type]
      ) REFERENCES [IA_type_ref] (
            [type]
      ),
      CONSTRAINT [fk2_IA_report] FOREIGN KEY
      (
            [keyword]
      ) REFERENCES [IA_keyword_ref] (
            [keyword]
      )
) ON [PRIMARY]


Table 2 as:

CREATE TABLE [IA_recommendation] (
      [recommendation_id] [int] IDENTITY (1, 1) NOT NULL ,
      [report_id] [int] NOT NULL ,
      [recommendation_nbr] [smallint] NOT NULL ,
      [completion_dt] [datetime] NULL ,
      [status] [varchar] (32) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL ,
      [risk] [varchar] (32) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL ,
      [division] [varchar] (32) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL ,
      [recommendation] [varchar] (2000) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL ,
      CONSTRAINT [pk_IA_recommendation] PRIMARY KEY  NONCLUSTERED
      (
            [recommendation_id]
      )  ON [PRIMARY] ,
      CONSTRAINT [fk1_IA_recommendation] FOREIGN KEY
      (
            [report_id]
      ) REFERENCES [IA_report] (
            [report_id]
      ),
      CONSTRAINT [fk2_IA_recommendation] FOREIGN KEY
      (
            [status]
      ) REFERENCES [IA_status_ref] (
            [status]
      ),
      CONSTRAINT [fk3_IA_recommendation] FOREIGN KEY
      (
            [risk]
      ) REFERENCES [IA_risk_ref] (
            [risk]
      ),
      CONSTRAINT [fk4_IA_recommendation] FOREIGN KEY
      (
            [division]
      ) REFERENCES [IA_division_ref] (
            [division]
      )
) ON [PRIMARY]

How do I truncate (not delete)  these tables?